diff --git a/frontend/src/components/BEPBreakEvenCard.vue b/frontend/src/components/BEPBreakEvenCard.vue
index 02b25830..4cc10a35 100644
--- a/frontend/src/components/BEPBreakEvenCard.vue
+++ b/frontend/src/components/BEPBreakEvenCard.vue
@@ -61,9 +61,11 @@
         <div class="detail-col">
           <div class="detail-title">📐 公式</div>
           <div class="detail-line">{{ card.formula }}</div>
-          <div class="detail-line sub">账面：{{ inputs.admin_avg.toFixed(1) }}万 ÷ {{ inputs.cm_pct.toFixed(2) }}% = {{ current.bep_revenue.toFixed(1) }}万</div>
+          <div v-if="mode === 'book'" class="detail-line sub">
+            账面：固定成本{{ inputs.admin_avg.toFixed(1) }}万 ÷ {{ inputs.cm_pct.toFixed(2) }}% = 保本{{ current.bep_revenue.toFixed(1) }}万（管理费含折旧）
+          </div>
           <div v-if="mode === 'cash'" class="detail-line sub">
-            现金：管理费{{ inputs.admin_avg.toFixed(1) }} − 折旧{{ inputs.dep_avg.toFixed(1) }} = {{ current.admin_avg.toFixed(1) }}万 ÷ {{ inputs.cm_pct.toFixed(2) }}%
+            现金：管理费{{ inputs.admin_avg.toFixed(1) }} − 折旧{{ inputs.dep_avg.toFixed(1) }} = {{ current.admin_avg.toFixed(1) }}万 ÷ {{ inputs.cm_pct.toFixed(2) }}% = 保本{{ current.bep_revenue.toFixed(1) }}万
           </div>
         </div>
         <div class="detail-col">