diff --git a/frontend/src/views/admin/ops/components/OpsDashboardHeader.vue b/frontend/src/views/admin/ops/components/OpsDashboardHeader.vue
index 8e5c9e8379..16e86b2161 100644
--- a/frontend/src/views/admin/ops/components/OpsDashboardHeader.vue
+++ b/frontend/src/views/admin/ops/components/OpsDashboardHeader.vue
@@ -10,6 +10,7 @@ import { opsAPI, type OpsDashboardOverview, type OpsMetricThresholds, type OpsRe
 import type { OpsRequestDetailsPreset } from './OpsRequestDetailsModal.vue'
 import { useAdminSettingsStore } from '@/stores'
 import { formatNumber } from '@/utils/format'
+import { formatMemorySizeMB } from '../utils/opsFormatters'
 
 type RealtimeWindow = '1min' | '5min' | '30min' | '1h'
 
@@ -1462,7 +1463,7 @@ function handleToolbarRefresh() {
             {{
               systemMetrics?.memory_used_mb == null || systemMetrics?.memory_total_mb == null
                 ? '-'
-                : `${formatNumber(systemMetrics.memory_used_mb)} / ${formatNumber(systemMetrics.memory_total_mb)} MB`
+                : `${formatMemorySizeMB(systemMetrics.memory_used_mb)} / ${formatMemorySizeMB(systemMetrics.memory_total_mb)}`
             }}
           </div>
         </div>
diff --git a/frontend/src/views/admin/ops/utils/__tests__/opsFormatters.spec.ts b/frontend/src/views/admin/ops/utils/__tests__/opsFormatters.spec.ts
new file mode 100644
index 0000000000..56b121b37f
--- /dev/null
+++ b/frontend/src/views/admin/ops/utils/__tests__/opsFormatters.spec.ts
@@ -0,0 +1,25 @@
+import { describe, expect, it } from 'vitest'
+
+import { formatMemorySizeMB } from '../opsFormatters'
+
+describe('formatMemorySizeMB', () => {
+  it('keeps capacities below one GiB in MB', () => {
+    expect(formatMemorySizeMB(61)).toBe('61 MB')
+    expect(formatMemorySizeMB(1023)).toBe('1023 MB')
+  })
+
+  it('converts capacities at or above one GiB to GB', () => {
+    expect(formatMemorySizeMB(1024)).toBe('1 GB')
+    expect(formatMemorySizeMB(1536)).toBe('1.5 GB')
+    expect(formatMemorySizeMB(32768)).toBe('32 GB')
+  })
+
+  it('handles zero and invalid values without producing a misleading unit', () => {
+    expect(formatMemorySizeMB(0)).toBe('0 MB')
+    expect(formatMemorySizeMB(-1)).toBe('-')
+    expect(formatMemorySizeMB(Number.NaN)).toBe('-')
+    expect(formatMemorySizeMB(Number.POSITIVE_INFINITY)).toBe('-')
+    expect(formatMemorySizeMB(null)).toBe('-')
+    expect(formatMemorySizeMB(undefined)).toBe('-')
+  })
+})
diff --git a/frontend/src/views/admin/ops/utils/opsFormatters.ts b/frontend/src/views/admin/ops/utils/opsFormatters.ts
index d503b5a5f1..9c96b0b021 100644
--- a/frontend/src/views/admin/ops/utils/opsFormatters.ts
+++ b/frontend/src/views/admin/ops/utils/opsFormatters.ts
@@ -73,3 +73,16 @@ export function formatByteRate(bytes: number, windowMinutes: number): string {
   const seconds = Math.max(1, (windowMinutes || 1) * 60)
   return `${formatBytes(bytes / seconds, 1)}/s`
 }
+
+/**
+ * 格式化 Ops 接口返回的内存容量。
+ *
+ * 后端的 `*_mb` 字段以 1024² 字节为单位换算得到；这里沿用该口径，
+ * 避免把大容量数值交给通用数字缩写格式化后出现“3.2万 MB”这类不直观的显示。
+ */
+export function formatMemorySizeMB(value: number | null | undefined): string {
+  if (typeof value !== 'number' || !Number.isFinite(value) || value < 0) return '-'
+  if (value === 0) return '0 MB'
+
+  return formatBytes(value * 1024 * 1024, 1)
+}