diff --git a/src/main/java/com/example/caseData/request/caseExchangeRequest/getCaseExchangeSearchPage.java b/src/main/java/com/example/caseData/request/caseExchangeRequest/getCaseExchangeSearchPage.java
index 9c6cae0..d621a9b 100644
--- a/src/main/java/com/example/caseData/request/caseExchangeRequest/getCaseExchangeSearchPage.java
+++ b/src/main/java/com/example/caseData/request/caseExchangeRequest/getCaseExchangeSearchPage.java
@@ -49,9 +49,15 @@ public class getCaseExchangeSearchPage {
         @JsonProperty("read_num")
         private String readNum;      // 阅读量
 
+        @JsonProperty("comment_num")
+        private String commentNum;      // 评论数
+
         @JsonProperty("push_date")
         private String pushDate;      // 发表时间
 
+        @JsonProperty("last_comment_time")
+        private String lastCommentTime;      // 最后评论时间
+
         public Map<String, String> toMap() {
             Map<String, String> map = new HashMap<>();
             if (StringUtils.hasText(createdAt)) {
@@ -62,10 +68,18 @@ public class getCaseExchangeSearchPage {
                 map.put("a.read_num", readNum);
             }
 
+            if (StringUtils.hasText(commentNum)) {
+                map.put("a.comment_num", commentNum);
+            }
+
             if (StringUtils.hasText(pushDate)) {
                 map.put("a.push_date", pushDate);
             }
 
+            if (StringUtils.hasText(lastCommentTime)) {
+                map.put("commentCreatedAt", lastCommentTime);
+            }
+
             // 默认排序（如果用户未传递任何排序字段）
             if (map.isEmpty()) {
                 map.put("a.updated_at", "desc");
diff --git a/src/main/resources/mapper/CaseExchangeMapper.xml b/src/main/resources/mapper/CaseExchangeMapper.xml
index 382daeb..369636a 100644
--- a/src/main/resources/mapper/CaseExchangeMapper.xml
+++ b/src/main/resources/mapper/CaseExchangeMapper.xml
@@ -53,12 +53,26 @@
         ) AS result
         JOIN case_exchange a ON result.exchange_id = a.exchange_id
         LEFT JOIN user c ON c.user_id = a.user_id
+        LEFT JOIN user_comment_exchange d ON d.exchange_id = a.exchange_id
         <if test="order != null and !order.isEmpty()">
             ORDER BY
             <foreach item="entry" index="key" collection="order" separator=",">
-                ${key} ${entry}
+                <choose>
+                    <when test="key == 'commentCreatedAt'">
+                        d.created_at ${entry}
+                    </when>
+                    <otherwise>
+                        ${key} ${entry}
+                    </otherwise>
+                </choose>
             </foreach>
         </if>
+<!--        <if test="order != null and !order.isEmpty()">-->
+<!--            ORDER BY-->
+<!--            <foreach item="entry" index="key" collection="order" separator=",">-->
+<!--                ${key} ${entry}-->
+<!--            </foreach>-->
+<!--        </if>-->
     </select>
 
     <select id="getCaseExchangeSearchList" resultMap="caseExchangeDtoMap">