diff --git a/backend/app/api/maps.py b/backend/app/api/maps.py
index 5143dfff..a3e0c62d 100644
--- a/backend/app/api/maps.py
+++ b/backend/app/api/maps.py
@@ -7,7 +7,11 @@ from app.database import get_db
 from app.deps import get_entity_id
 from app.auth_middleware import require_auth, require_role
 from app.models import StrategicMap, OperationLog, MapObjective, Objective, KR, KPIDefinition, ReviewRecord, User
+from app.utils.kr_name import sanitize_kr_name
 import json
+import logging
+
+logger = logging.getLogger(__name__)
 
 router = APIRouter(prefix="/api/cma/maps", tags=["战略地图"],
     dependencies=[Depends(require_role("ceo", "finance"))],
@@ -481,6 +485,16 @@ def _sync_objectives_krs(m, db):
                     if kpi and kpi.threshold_green:
                         op2, tgt2 = _parse_kr_operator_target(kpi.threshold_green)
                         op, tgt = op2, (tgt2 if tgt is None else tgt)
+                # 护栏（2026-09-16）：名称尾部「≥/≤+数字」与目标值不一致 = 历史污染截断值，
+                # 在此透传点（JSON/模板名 → krs.title）规整，防止污染继续传染（判据见 app/utils/kr_name.py）
+                clean_title, _polluted = sanitize_kr_name(title, kr_item.get("target_value"), tgt)
+                if _polluted:
+                    logger.warning(
+                        "KR名称污染已规整: map=%s objective=%s %r -> %r (target=%s)",
+                        m.id, objective.id, title, clean_title, tgt,
+                    )
+                    title = clean_title
+                    kr_item["name"] = clean_title  # 同步回写 JSON，保持展示口径=落库口径
                 kr = existing_krs.get(title)
                 if kr is None:
                     kr = KR(
diff --git a/backend/app/api/okr.py b/backend/app/api/okr.py
index 3c2d01d1..cd7cd207 100644
--- a/backend/app/api/okr.py
+++ b/backend/app/api/okr.py
@@ -11,6 +11,10 @@ from app.database import get_db
 from app.deps import get_entity_id
 from app.auth_middleware import require_role
 from app.models import Objective, ActionPlan, KR, ObjectiveKPI, KPIDefinition
+from app.utils.kr_name import sanitize_kr_name
+import logging
+
+logger = logging.getLogger(__name__)
 
 router = APIRouter(prefix="/api/cma/okr", tags=["OKR目标管理"],
     dependencies=[Depends(require_role("ceo", "finance", "it"))],
@@ -329,6 +333,14 @@ def sync_krs(objective_id: int, data: dict, db: Session = Depends(get_db),
             kpi_id = kpi.id if kpi else None
         operator, target_value = _inherit_kpi_direction(db, kpi_id, item.get("operator"), item.get("target_value"))
 
+        # 护栏（2026-09-16）：画布节点/接口传来的 KR 名若带历史污染尾巴（尾部「≥/≤+被截断的数字」）
+        # 在此规整，防污染经 krs.title 继续传染（判据见 app/utils/kr_name.py）
+        _tv = item.get("target_value")
+        title, _polluted = sanitize_kr_name(title, _tv if _tv is not None else target_value)
+        if _polluted:
+            logger.warning("KR名称污染已规整: objective=%s %r -> %r (target=%s)",
+                           objective_id, item.get("title") or item.get("name"), title, _tv)
+
         kr = None
         if item.get("id") and int(item["id"]) in existing:
             kr = existing[int(item["id"])]
diff --git a/backend/app/api/okr_templates.py b/backend/app/api/okr_templates.py
index 05c3c479..797681ea 100644
--- a/backend/app/api/okr_templates.py
+++ b/backend/app/api/okr_templates.py
@@ -7,6 +7,7 @@ from typing import Optional
 from app.database import get_db
 from app.auth_middleware import require_role
 from app.models import OKRTemplate, StrategicMap
+from app.utils.kr_name import sanitize_kr_name
 
 router = APIRouter(prefix="/api/cma/okr-templates", tags=["OKR模板库"],
     dependencies=[Depends(require_role("ceo", "finance", "it"))],
@@ -273,7 +274,8 @@ def apply_okr_template(template_id: int, data: dict, db: Session = Depends(get_d
                 "kpis": [],
                 "krs": [
                     {
-                        "name": kr.get("name", ""),
+                        # 护栏（2026-09-16）：模板名 → 新地图 KR 名 透传点，污染名（尾部符号+截断数字）在此规整
+                        "name": sanitize_kr_name(kr.get("name", ""), kr.get("target_value"))[0],
                         "target_value": kr.get("target_value", ""),
                         "weight": kr.get("weight", 33),
                         "metric_kpi_id": kr.get("metric_kpi_id"),
diff --git a/backend/app/utils/kr_name.py b/backend/app/utils/kr_name.py
new file mode 100644
index 00000000..436623cf
--- /dev/null
+++ b/backend/app/utils/kr_name.py
@@ -0,0 +1,54 @@
+"""KR 名称规整（历史名称污染防护）。
+
+背景：2026-09-11 前 `MapCanvasDialogs.vue` 的逐键写入点会把「方向符号 + 已输入的首位数字」
+拼进 KR 名称（输入 780 → 名称变 `营业收入≥7`）。写入口已删，但**存量数据仍在传染**：
+对话框用模板 `preset_krs` 预填 KR 名 → 沿用到新目标/新地图。
+
+判据（勿一刀切）：
+- 名称尾部「≥/≤ + 数字」且该数字 **≠** 目标值 → 截断值（污染）→ 去掉尾部片段；
+- 数字 **==** 目标值 → 有意命名（如 `渠道留存率≥90` / `新客户数≥10` / `A级渠道占比≥30%`）→ 原样保留；
+- 目标值里取不到数字（如 `为正` / `TOP3` / 空值）→ 无法判定 → 原样保留（不擅改）。
+
+用法（护栏放在「JSON/模板名 → krs.title」的透传点，而不是用户输入点）：
+    from app.utils.kr_name import sanitize_kr_name
+    clean, changed = sanitize_kr_name(name, target_value)
+"""
+import re
+from typing import Any, Optional, Tuple
+
+_NUM = re.compile(r"[-+]?\d*\.?\d+")
+_TAIL = re.compile(r"^(?P<base>.*?)\s*(?P<sym>[≥≤])\s*(?P<num>\d+(?:\.\d+)?)\s*$")
+
+
+def target_number(target_value: Any) -> Optional[float]:
+    """从目标值里取数字（兼容 780 / '780' / '≥780' / '≤45天' / '≥20%'）；取不到返回 None。"""
+    if target_value is None:
+        return None
+    if isinstance(target_value, bool):
+        return None
+    if isinstance(target_value, (int, float)):
+        return float(target_value)
+    m = _NUM.search(str(target_value))
+    return float(m.group(0)) if m else None
+
+
+def sanitize_kr_name(
+    name: Any,
+    target_value: Any = None,
+    target_number_value: Optional[float] = None,
+) -> Tuple[str, bool]:
+    """返回 (规整后名称, 是否发生变更)。target_number_value 可显式传入已解析的目标数（优先）。"""
+    if not isinstance(name, str):
+        return ("" if name is None else str(name)), False
+    m = _TAIL.match(name)
+    if not m:
+        return name, False
+    tn = target_number_value if target_number_value is not None else target_number(target_value)
+    if tn is None:
+        return name, False
+    if abs(float(m.group("num")) - tn) < 1e-9:
+        return name, False
+    clean = m.group("base").strip()
+    if not clean:
+        return name, False
+    return clean, True
diff --git a/backend/tests/test_kr_name_pollution_20260916.py b/backend/tests/test_kr_name_pollution_20260916.py
new file mode 100644
index 00000000..77d2b376
--- /dev/null
+++ b/backend/tests/test_kr_name_pollution_20260916.py
@@ -0,0 +1,178 @@
+"""KR 名称污染（历史截断值）护栏测试 — 任务 cma-kr-name-pollution-cleanup-20260916
+
+覆盖：
+1. 判据单测（sanitize_kr_name / target_number）：污染截断、有意命名、无法判定三类
+2. 「JSON/模板名 → krs.title」透传点护栏：
+   - PUT /api/cma/maps/{id}（_sync_objectives_krs）
+   - PUT /api/cma/okr/{objective_id}/krs/sync（画布节点同步）
+   - POST /api/cma/okr-templates/{id}/apply（模板 → 新地图）
+3. 阴性对照：合法命名（渠道留存率≥90 / 新客户数≥10）经同样路径不得被改
+"""
+import json
+
+import pytest
+from fastapi.testclient import TestClient
+from sqlalchemy.orm import Session
+
+from app.models import KR, Objective, OKRTemplate, StrategicMap
+from app.utils.kr_name import sanitize_kr_name, target_number
+from tests.conftest import create_test_user, get_token_for_user, auth_header
+
+
+# ────────────────────────── 1. 判据单测 ──────────────────────────
+
+class TestSanitizeKrName:
+    @pytest.mark.parametrize("name,target,expect", [
+        ("营业收入≥2", 2500, "营业收入"),          # 输入 2500 时截断成首位数字
+        ("新客户数≥1", 5, "新客户数"),
+        ("营业收入≥7", 780, "营业收入"),
+        ("净利润≥6", 60, "净利润"),
+        ("费用率≤3", 30, "费用率"),
+        ("经营性现金流≥5", 50, "经营性现金流"),
+        ("营业收入≥2", "2500", "营业收入"),         # 目标值为字符串数字
+        ("应收账款天数≤4", "≤45天", "应收账款天数"),  # 目标值带单位文本
+    ])
+    def test_polluted_tail_stripped(self, name, target, expect):
+        clean, changed = sanitize_kr_name(name, target)
+        assert changed is True
+        assert clean == expect
+
+    @pytest.mark.parametrize("name,target", [
+        ("渠道留存率≥90", 90),          # 数字==目标值 = 有意命名
+        ("新客户数≥10", 10),
+        ("A级渠道占比≥30%", 30),
+        ("营业收入≥780", 780),
+        ("费用率≤30", 30),
+        ("现金折扣收益≤收入20%", 20),   # 尾部不是「符号+数字」
+        ("库存周转天数≤45天", "≤45天"),
+        ("数据质量评分≥90", 90.0),
+        ("剔除现金折扣后经营性净利≥0", 0),
+    ])
+    def test_legal_names_untouched(self, name, target):
+        clean, changed = sanitize_kr_name(name, target)
+        assert changed is False
+        assert clean == name
+
+    @pytest.mark.parametrize("name,target", [
+        ("NPS净推荐值≥60", "为正"),   # 目标值无数字 → 无法判定，原样保留
+        ("总资产周转率≥1.0", None),
+        ("自由现金流≥0", ""),
+        ("经营现金流为正", "为正"),   # 无尾部符号+数字
+    ])
+    def test_unknown_target_untouched(self, name, target):
+        clean, changed = sanitize_kr_name(name, target)
+        assert changed is False
+        assert clean == name
+
+    def test_empty_base_kept(self):
+        """名称主体为空（只剩符号+数字）时不动，避免产出空标题"""
+        clean, changed = sanitize_kr_name("≥2", 2500)
+        assert changed is False
+        assert clean == "≥2"
+
+    def test_non_string_input(self):
+        clean, changed = sanitize_kr_name(None, 100)
+        assert changed is False and clean == ""
+
+    def test_target_number_parsing(self):
+        assert target_number("≥45天") == 45
+        assert target_number("≥20%") == 20
+        assert target_number(780) == 780
+        assert target_number("为正") is None
+        assert target_number(None) is None
+
+
+# ────────────────────────── 2. 透传点护栏 ──────────────────────────
+
+def _dims_with_krs(name, target_value):
+    return [
+        {"key": "finance", "name": "财务层", "icon": "💰", "color": "#F56C6C",
+         "objectives": [{"name": "营收目标", "kpis": [],
+                         "krs": [{"name": name, "target_value": target_value,
+                                  "weight": 70, "operator": ">="}]}]},
+        {"key": "customer", "name": "客户层", "icon": "🤝", "color": "#67c23a", "objectives": []},
+    ]
+
+
+class TestPassThroughGuards:
+    def _setup(self, db: Session):
+        user = create_test_user(db)
+        return user
+
+    def test_map_save_strips_polluted_kr_title(self, client: TestClient, db: Session):
+        """PUT /maps/{id} 的 JSON→krs.title 同步点：污染名被规整（库 + JSON 双清）"""
+        self._setup(db)
+        token = get_token_for_user(client)
+        m = StrategicMap(title="测试地图", status="draft", entity_id=1,
+                         dimensions=_dims_with_krs("营业收入≥2", 25000),
+                         canvas_data={"connections": []})
+        db.add(m)
+        db.commit()
+        db.refresh(m)
+
+        resp = client.put(f"/api/cma/maps/{m.id}", headers=auth_header(token),
+                          json={"dimensions": _dims_with_krs("营业收入≥2", 25000)})
+        assert resp.status_code == 200, resp.text
+
+        kr = db.query(KR).filter(KR.objective_id.isnot(None)).first()
+        assert kr is not None and kr.title == "营业收入"
+        assert float(kr.target_value) == 25000.0
+        # JSON 回写：展示口径 = 落库口径（回查须先失效身份映射，防读到旧快照）
+        db.expire_all()
+        m2 = db.query(StrategicMap).filter(StrategicMap.id == m.id).first()
+        dims = m2.dimensions
+        dims = json.loads(dims) if isinstance(dims, str) else dims
+        assert dims[0]["objectives"][0]["krs"][0]["name"] == "营业收入"
+
+    def test_map_save_keeps_legal_kr_title(self, client: TestClient, db: Session):
+        """阴性对照：合法命名（数字==目标值）不得被改"""
+        self._setup(db)
+        token = get_token_for_user(client)
+        m = StrategicMap(title="测试地图", status="draft", entity_id=1,
+                         dimensions=_dims_with_krs("渠道留存率≥90", 90),
+                         canvas_data={"connections": []})
+        db.add(m)
+        db.commit()
+        db.refresh(m)
+
+        resp = client.put(f"/api/cma/maps/{m.id}", headers=auth_header(token),
+                          json={"dimensions": _dims_with_krs("渠道留存率≥90", 90)})
+        assert resp.status_code == 200, resp.text
+        kr = db.query(KR).filter(KR.objective_id.isnot(None)).first()
+        assert kr is not None and kr.title == "渠道留存率≥90"
+
+    def test_kr_sync_endpoint_strips_polluted_title(self, client: TestClient, db: Session):
+        """PUT /okr/{oid}/krs/sync（画布节点同步）同样被护栏覆盖"""
+        self._setup(db)
+        token = get_token_for_user(client)
+        obj = Objective(entity_id=1, title="营收目标", dimension="finance", status="active",
+                        quarter="2026Q3")
+        db.add(obj)
+        db.commit()
+        db.refresh(obj)
+
+        resp = client.put(f"/api/cma/okr/{obj.id}/krs/sync", headers=auth_header(token),
+                          json={"krs": [{"title": "新客户数≥1", "operator": ">=", "target_value": 100,
+                                         "weight": 30}]})
+        assert resp.status_code == 200, resp.text
+        krs = db.query(KR).filter(KR.objective_id == obj.id).all()
+        assert [k.title for k in krs] == ["新客户数"]
+
+    def test_apply_template_strips_polluted_kr_name(self, client: TestClient, db: Session):
+        """POST /okr-templates/{id}/apply：存量污染模板 → 新地图 KR 名干净"""
+        self._setup(db)
+        token = get_token_for_user(client)
+        t = OKRTemplate(name="营收目标", description="", dimension="finance", layer="level3",
+                        industry_tag="general", source="system",
+                        preset_krs=[{"name": "营业收入≥2", "target_value": 2500, "weight": 70},
+                                    {"name": "渠道留存率≥90", "target_value": 90, "weight": 30}])
+        db.add(t)
+        db.commit()
+        db.refresh(t)
+
+        resp = client.post(f"/api/cma/okr-templates/{t.id}/apply", headers=auth_header(token),
+                           json={"title": "套用模板-护栏验证"})
+        assert resp.status_code == 200, resp.text
+        m = db.query(StrategicMap).filter(StrategicMap.id == resp.json()["map_id"]).first()
+        names = [k["name"] for k in m.dimensions[0]["objectives"][0]["krs"]]
+        assert names == ["营业收入", "渠道留存率≥90"]
diff --git a/frontend/src/components/map-canvas/MapCanvasDialogs.vue b/frontend/src/components/map-canvas/MapCanvasDialogs.vue
index bca88503..e3b40d2f 100644
--- a/frontend/src/components/map-canvas/MapCanvasDialogs.vue
+++ b/frontend/src/components/map-canvas/MapCanvasDialogs.vue
@@ -251,6 +251,7 @@ import { ref, computed, watch, onMounted } from "vue"
 import { useRouter } from "vue-router"
 import { ElMessage } from "element-plus"
 import { okrTemplateApi } from "../../api/index"
+import { sanitizeKrName } from "../../utils/krName"
 
 // ── Props ──
 const props = defineProps<{
@@ -560,7 +561,8 @@ function nextStep() {
     krs: tmpl.preset_krs.map((kr: any) => {
       const parsed = parseKrTarget(kr.target_value)
       return {
-        name: kr.name,
+        // 护栏（2026-09-16）：模板名 → KR 名 预填透传点；历史污染名（尾部被截断的方向值）在此规整
+        name: sanitizeKrName(kr.name, kr.target_value).name,
         operator: parsed.operator,
         target_value: parsed.value,
         weight: Number(kr.weight) || 33,
diff --git a/frontend/src/utils/krName.ts b/frontend/src/utils/krName.ts
new file mode 100644
index 00000000..6f175f17
--- /dev/null
+++ b/frontend/src/utils/krName.ts
@@ -0,0 +1,32 @@
+/**
+ * KR 名称规整（历史名称污染防护）— 与后端 backend/app/utils/kr_name.py 同规则。
+ *
+ * 背景：2026-09-11 前的逐键写入点会把「方向符号 + 已输入的首位数字」拼进 KR 名称
+ * （输入 780 → 名称变 `营业收入≥7`）。写入口已删，但存量模板名仍会经「模板 → KR」预填传染。
+ *
+ * 判据（勿一刀切）：
+ * - 名称尾部「≥/≤ + 数字」且该数字 ≠ 目标值 → 截断值（污染）→ 去掉尾部片段；
+ * - 数字 == 目标值 → 有意命名（`渠道留存率≥90` / `新客户数≥10`）→ 保留；
+ * - 目标值取不到数字（`为正`/`TOP3`/空）→ 无法判定 → 保留。
+ */
+const NUM = /[-+]?\d*\.?\d+/;
+const TAIL = /^(.*?)\s*[≥≤]\s*(\d+(?:\.\d+)?)\s*$/;
+
+export function targetNumber(targetValue: any): number | null {
+  if (targetValue === null || targetValue === undefined || targetValue === "") return null;
+  if (typeof targetValue === "number") return Number.isFinite(targetValue) ? targetValue : null;
+  const m = String(targetValue).match(NUM);
+  return m ? parseFloat(m[0]) : null;
+}
+
+export function sanitizeKrName(name: any, targetValue: any): { name: string; changed: boolean } {
+  const raw = name === null || name === undefined ? "" : String(name);
+  const m = raw.match(TAIL);
+  if (!m) return { name: raw, changed: false };
+  const tn = targetNumber(targetValue);
+  if (tn === null) return { name: raw, changed: false };
+  if (Math.abs(parseFloat(m[2]) - tn) < 1e-9) return { name: raw, changed: false };
+  const base = m[1].trim();
+  if (!base) return { name: raw, changed: false };
+  return { name: base, changed: true };
+}
diff --git a/frontend/src/views/MapCanvas.vue b/frontend/src/views/MapCanvas.vue
index 55290862..0ec9b948 100644
--- a/frontend/src/views/MapCanvas.vue
+++ b/frontend/src/views/MapCanvas.vue
@@ -183,6 +183,7 @@ import KnowledgePanel from '../components/KnowledgePanel.vue'
 import api from "../api/index"
 import { LAYER_CONFIG, LAYER_KEYS, getLayerList } from "../config/layers"
 import { useFormGuard } from "../composables/useFormGuard"
+import { sanitizeKrName } from "../utils/krName"
 import StrategyLayer from "../components/strategy-map/StrategyLayer.vue"
 import ConnectionLines from "../components/strategy/ConnectionLines.vue"
 import MapCanvasToolbar from "../components/map-canvas/MapCanvasToolbar.vue"
@@ -909,7 +910,9 @@ async function saveUserTemplate(data: any, layer: string) {
       description: (data.description || '').trim(),
       dimension: layer,
       preset_krs: (data.krs || []).map((kr: any) => ({
-        name: kr.name,
+        // 护栏（2026-09-16）：画布 KR 名 → 模板库 透传点，历史污染尾巴（截断值）在此规整，
+        // 防污染经用户自定义模板再次传染新目标
+        name: sanitizeKrName(kr.name, kr.target_value).name,
         target_value: kr.target_value,
         weight: kr.weight || 33,
       })),