diff --git a/backend/app/api/kpi_governance.py b/backend/app/api/kpi_governance.py
index ab39d3e5..a0af7c8c 100644
--- a/backend/app/api/kpi_governance.py
+++ b/backend/app/api/kpi_governance.py
@@ -27,7 +27,9 @@ router = APIRouter(
 # 维度 → 编码前缀
 DIM_PREFIX = {"finance": "F", "customer": "C", "process": "P", "learning": "L"}
 # 历史遗留兼容前缀: EXT_ = 科目余额表导入的财务科目KPI（仅限 finance 维度）
-LEGACY_PREFIX_DIM = {"EXT": "finance"}
+LEGACY_PREFIX_DIM = {"EXT": "finance", "FB": "process"}
+# 品牌级业务KPI前缀（跨维度合法，2026-08-21 治理审计适配: BH_ = 博海业务KPI系列）
+BRAND_PREFIXES = ("BH",)
 VALID_LEVELS = ("strategic", "operational")
 # 视为"未完善"的占位符值
 PLACEHOLDERS = ("待补充", "待指定", "待完善", "待定", "暂无", "TBD", "tbd", "-", "--", "N/A", "n/a")
@@ -106,7 +108,9 @@ def validate_kpi_payload(
             prefix = code.split("_")[0] if "_" in code else code
             if prefix not in ("F", "C", "P", "L"):
                 # 兼容历史遗留 EXT_ 前缀（科目余额表导入的财务科目KPI，仅限finance维度）
-                if not (LEGACY_PREFIX_DIM.get(prefix) and dimension == LEGACY_PREFIX_DIM[prefix]):
+                # 兼容 FB_ 前缀（财务Bot KPI，仅限process维度）与 BH_ 品牌前缀（跨维度合法）
+                if not (LEGACY_PREFIX_DIM.get(prefix) and dimension == LEGACY_PREFIX_DIM[prefix]) \
+                        and prefix not in BRAND_PREFIXES:
                     add(3, "kpi_code", f"编码前缀不符: {code} 应以F_/C_/P_/L_开头")
             elif dimension and DIM_PREFIX.get(dimension) and prefix != DIM_PREFIX[dimension]:
                 expected = DIM_PREFIX[dimension]