diff --git a/frontend/src/views/pipeline/FactorDetail.spec.ts b/frontend/src/views/pipeline/FactorDetail.spec.ts
index ea5e87b8..b3fe3f5c 100644
--- a/frontend/src/views/pipeline/FactorDetail.spec.ts
+++ b/frontend/src/views/pipeline/FactorDetail.spec.ts
@@ -155,4 +155,18 @@ describe('FactorDetail.vue 全期弹药+疑似换皮(spec §4.2 2026-10-10)', ()
     expect(w.text()).toContain('月度点不足或首班未跑')
     expect(w.findAll('.sim-chip').length).toBe(0)
   })
+  it('codex review:tAll=null(样本不足/方差0)时其余弹药字段照常渲染,合成t 单独 —', async () => {
+    const w = await mountDetail({
+      factor: { ...DETAIL.factor,
+        icStats: { icAll: 0.04, tAll: null, positiveRatio: 0.8,
+                   byYear: { 2025: 0.05 } } },
+      birth: null,
+    })
+    expect(w.text()).toContain('全期IC 0.0400')
+    expect(w.text()).toContain('合成t —')
+    expect(w.text()).toContain('正IC占比 80%')
+    expect(w.text()).toContain('2025:0.0500')
+    // 区分「无报告」:此态不再出占位文案
+    expect(w.text()).not.toContain('月度点不足或首班未跑')
+  })
 })
diff --git a/frontend/src/views/pipeline/FactorDetail.vue b/frontend/src/views/pipeline/FactorDetail.vue
index 977cbc6a..9f47c1cd 100644
--- a/frontend/src/views/pipeline/FactorDetail.vue
+++ b/frontend/src/views/pipeline/FactorDetail.vue
@@ -126,10 +126,10 @@ function goFactor(n: string): void {
         </div>
         <div class="brow"><span class="bk">全期弹药</span>
           <span class="val">
-            <template v-if="detail.factor.icStats && detail.factor.icStats.tAll !== null">
-              全期IC {{ detail.factor.icStats.icAll?.toFixed(4) }} ·
-              合成t {{ detail.factor.icStats.tAll?.toFixed(2) }} ·
-              正IC占比 {{ ((detail.factor.icStats.positiveRatio ?? 0) * 100).toFixed(0) }}% ·
+            <template v-if="detail.factor.icStats">
+              全期IC {{ detail.factor.icStats.icAll?.toFixed(4) ?? '—' }} ·
+              合成t <span :title="detail.factor.icStats.tAll === null ? 'n<2 或方差为 0,如实不算' : ''">{{ detail.factor.icStats.tAll !== null && detail.factor.icStats.tAll !== undefined ? detail.factor.icStats.tAll.toFixed(2) : '—' }}</span> ·
+              正IC占比 {{ detail.factor.icStats.positiveRatio !== null && detail.factor.icStats.positiveRatio !== undefined ? `${(detail.factor.icStats.positiveRatio * 100).toFixed(0)}%` : '—' }} ·
               逐年 {{ Object.entries(detail.factor.icStats.byYear).map(([y, v]) => `${y}:${v.toFixed(4)}`).join(' ') || '—' }}
             </template>
             <template v-else>—（月度点不足或首班未跑）</template>