diff --git a/src/views/ValueForum/components/TradeModal.js b/src/views/ValueForum/components/TradeModal.js
index 9e475c57..f205b822 100644
--- a/src/views/ValueForum/components/TradeModal.js
+++ b/src/views/ValueForum/components/TradeModal.js
@@ -80,10 +80,22 @@ const TradeModal = ({ isOpen, onClose, topic, mode = 'buy', onTradeSuccess }) =>
 
   if (!topic || !userAccount) return null;
 
+  // 构建市场数据（兼容后端字段）
+  const positions = {
+    yes: {
+      total_shares: topic.yes_total_shares || 0,
+      current_price: topic.yes_price || 500,
+    },
+    no: {
+      total_shares: topic.no_total_shares || 0,
+      current_price: topic.no_price || 500,
+    },
+  };
+
   // 获取市场数据
-  const selectedSide = topic.positions[selectedOption];
+  const selectedSide = positions[selectedOption];
   const otherOption = selectedOption === 'yes' ? 'no' : 'yes';
-  const otherSide = topic.positions[otherOption];
+  const otherSide = positions[otherOption];
 
   // 计算交易数据
   let cost = 0;
@@ -278,14 +290,14 @@ const TradeModal = ({ isOpen, onClose, topic, mode = 'buy', onTradeSuccess }) =>
                               </Text>
                             </HStack>
                             <Text fontSize="xs" color={forumColors.text.secondary}>
-                              {topic.positions.yes.total_shares}份持仓
+                              {positions.yes.total_shares}份持仓
                             </Text>
                           </VStack>
                         </HStack>
 
                         <VStack align="end" spacing="0">
                           <Text fontSize="xl" fontWeight="bold" color="green.600">
-                            {Math.round(topic.positions.yes.current_price)}
+                            {Math.round(positions.yes.current_price)}
                           </Text>
                           <Text fontSize="xs" color={forumColors.text.secondary}>
                             积分/份
@@ -324,14 +336,14 @@ const TradeModal = ({ isOpen, onClose, topic, mode = 'buy', onTradeSuccess }) =>
                               </Text>
                             </HStack>
                             <Text fontSize="xs" color={forumColors.text.secondary}>
-                              {topic.positions.no.total_shares}份持仓
+                              {positions.no.total_shares}份持仓
                             </Text>
                           </VStack>
                         </HStack>
 
                         <VStack align="end" spacing="0">
                           <Text fontSize="xl" fontWeight="bold" color="red.600">
-                            {Math.round(topic.positions.no.current_price)}
+                            {Math.round(positions.no.current_price)}
                           </Text>
                           <Text fontSize="xs" color={forumColors.text.secondary}>
                             积分/份