diff --git a/src/components/StockChart/KLineChartModal.tsx b/src/components/StockChart/KLineChartModal.tsx
index 76d1e0ee..1fd1a118 100644
--- a/src/components/StockChart/KLineChartModal.tsx
+++ b/src/components/StockChart/KLineChartModal.tsx
@@ -42,6 +42,8 @@ export interface KLineChartModalProps {
   eventTime?: string | null;
   /** 模态框大小 */
   size?: string;
+  /** z-index 层级（用于嵌套 Modal 场景） */
+  zIndex?: number;
 }
 
 /**
@@ -62,6 +64,7 @@ const KLineChartModal: React.FC<KLineChartModalProps> = ({
   stock,
   eventTime,
   size = '5xl',
+  zIndex,
 }) => {
   const chartRef = useRef<HTMLDivElement>(null);
   const chartInstance = useRef<echarts.ECharts | null>(null);
@@ -447,13 +450,14 @@ const KLineChartModal: React.FC<KLineChartModalProps> = ({
 
   return (
     <Modal isOpen={isOpen} onClose={onClose} size={size}>
-      <ModalOverlay bg="blackAlpha.700" />
+      <ModalOverlay bg="blackAlpha.700" zIndex={zIndex} />
       <ModalContent
         maxW="90vw"
         maxH="85vh"
         bg="#1a1a1a"
         borderColor="#404040"
         borderWidth="1px"
+        zIndex={zIndex}
       >
         <ModalHeader pb={3} borderBottomWidth="1px" borderColor="#404040">
           <VStack align="flex-start" spacing={1}>
diff --git a/src/views/Community/components/InvestmentCalendar.js b/src/views/Community/components/InvestmentCalendar.js
index 380ba103..fd4e9e30 100644
--- a/src/views/Community/components/InvestmentCalendar.js
+++ b/src/views/Community/components/InvestmentCalendar.js
@@ -840,7 +840,7 @@ const InvestmentCalendar = () => {
                 )}
             </Modal>
 
-            {/* K线图弹窗 */}
+            {/* K线图弹窗 - 需要更高的 z-index，因为投资日历本身就是 Modal */}
             {selectedStock && (
                 <KLineChartModal
                     isOpen={klineModalVisible}
@@ -851,6 +851,8 @@ const InvestmentCalendar = () => {
                     }}
                     stock={selectedStock}
                     eventTime={selectedEventTime}
+                    size="5xl"
+                    zIndex={2000}
                 />
             )}