diff --git a/packages/screen/src/views/3DSituationalAwarenessRefactor/index.vue b/packages/screen/src/views/3DSituationalAwarenessRefactor/index.vue
index 2aee13b..6b73b39 100644
--- a/packages/screen/src/views/3DSituationalAwarenessRefactor/index.vue
+++ b/packages/screen/src/views/3DSituationalAwarenessRefactor/index.vue
@@ -560,16 +560,16 @@ const showMapTooltip = ({ x, y, title = "", icon = "", data = null }) => {
   container-name: situational-awareness;
   container-type: size;
 
-  // 为旧版浏览器提供视口单位回退
-  --cq-inline-100: 100vw;
-  --cq-block-100: 100vh;
+  // 为旧版浏览器提供视口单位回退，封顶 1920×1080
+  --cq-inline-100: clamp(0px, 100vw, 1920px);
+  --cq-block-100: clamp(0px, 100vh, 1080px);
 
-  // 当支持容器单位时覆盖为容器单位
+  // 当支持容器单位时覆盖为容器单位，同样封顶
   @supports (width: 1cqw) {
-    --cq-inline-100: 100cqw;
+    --cq-inline-100: min(100cqw, 1920px);
   }
   @supports (height: 1cqh) {
-    --cq-block-100: 100cqh;
+    --cq-block-100: min(100cqh, 1080px);
   }
 
   // 可配置的布局变量（使用 calc 直接计算，避免函数嵌套）
@@ -586,10 +586,13 @@ const showMapTooltip = ({ x, y, title = "", icon = "", data = null }) => {
   position: relative;
   width: 100%;
   height: 100%;
+  // max-width: 1920px;
+  // max-height: 1080px;
   min-width: var(--sa-min-width);
   min-height: var(--sa-min-height);
   background-color: var(--bg-dark);
-  overflow: auto; // 当宿主尺寸 < 最小尺寸时允许滚动
+  overflow-x: hidden;
+  overflow-y: auto; // 当宿主尺寸 < 最小尺寸时允许滚动，达到上限时不放大
 
   // PageHeader 浮在顶部
   > :first-child {