diff --git a/backend/src/main/java/com/yfd/platform/qgc_base/domain/SdFbrdBH.java b/backend/src/main/java/com/yfd/platform/qgc_base/domain/SdFbrdBH.java
index 3c418154..139ddff5 100644
--- a/backend/src/main/java/com/yfd/platform/qgc_base/domain/SdFbrdBH.java
+++ b/backend/src/main/java/com/yfd/platform/qgc_base/domain/SdFbrdBH.java
@@ -198,7 +198,7 @@ public class SdFbrdBH implements Serializable {
     /**
      * 增殖放流工艺
      */
-    private BigDecimal zzflgy;
+    private String zzflgy;
 
     /**
      * 增殖放流鱼种描述
@@ -259,7 +259,7 @@ public class SdFbrdBH implements Serializable {
     /**
      * 植被覆盖类型
      */
-    private BigDecimal vlsr;
+    private String vlsr;
 
     /**
      * 植被覆盖调查时间
diff --git a/backend/src/main/java/com/yfd/platform/qgc_base/domain/SdOpinfoBH.java b/backend/src/main/java/com/yfd/platform/qgc_base/domain/SdOpinfoBH.java
index 68921b4d..a519b50a 100644
--- a/backend/src/main/java/com/yfd/platform/qgc_base/domain/SdOpinfoBH.java
+++ b/backend/src/main/java/com/yfd/platform/qgc_base/domain/SdOpinfoBH.java
@@ -218,4 +218,12 @@ public class SdOpinfoBH implements Serializable {
     @TableField("DELETE_TIME")
     @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8")
     private Date deleteTime;
+
+    /** 所属站类全路径（非数据库字段） */
+    @TableField(exist = false)
+    private String sttpFullPath;
+
+    /** 所属站类层级（非数据库字段） */
+    @TableField(exist = false)
+    private Integer sttpTreeLevel;
 }
diff --git a/backend/src/main/java/com/yfd/platform/qgc_sys/threedRoam/service/impl/MsThreedRoamMServiceImpl.java b/backend/src/main/java/com/yfd/platform/qgc_sys/threedRoam/service/impl/MsThreedRoamMServiceImpl.java
index ce7790eb..09604787 100644
--- a/backend/src/main/java/com/yfd/platform/qgc_sys/threedRoam/service/impl/MsThreedRoamMServiceImpl.java
+++ b/backend/src/main/java/com/yfd/platform/qgc_sys/threedRoam/service/impl/MsThreedRoamMServiceImpl.java
@@ -266,6 +266,10 @@ public class MsThreedRoamMServiceImpl extends ServiceImpl<MsThreedRoamMMapper, M
         return result > 0;
     }
 
+
+    /** 时间缩放系数 */
+    private static final BigDecimal TIME_SCALE = new BigDecimal("0.2");
+
     @Override
     public MsThreedRoamBVO getThreedRoamData(DataSourceRequest dataSourceRequest) {
         DataSourceLoadOptionsBase loadOptions = dataSourceRequest.toDevRequest();
@@ -282,22 +286,34 @@ public class MsThreedRoamMServiceImpl extends ServiceImpl<MsThreedRoamMMapper, M
         wrapper.orderByAsc("ORDER_INDEX");
         List<MsThreedRoamEntity> threedRoamList = msThreedRoamMapper.selectList(wrapper);
 
-        BigDecimal totalTime = BigDecimal.ZERO;
-        List<Object> lists = new ArrayList<>();
-        String baseCode = "";
+        if (CollUtil.isEmpty(threedRoamList)) {
+            MsThreedRoamBVO empty = new MsThreedRoamBVO();
+            empty.setList(Collections.emptyList());
+            empty.setTotalTime(BigDecimal.ZERO);
+            empty.setCode("");
+            empty.setMilestoneList(Collections.emptyList());
+            return empty;
+        }
+
+        int size = threedRoamList.size();
+        // 每条记录输出4个元素（总时间+经度+纬度+高程），预分配避免扩容
+        List<Object> lists = new ArrayList<>(size * 4);
         List<String[]> milestoneList = new ArrayList<>();
-        List<String> stcdList = new ArrayList<>();
+        // HashSet O(1) 去重，避免 ArrayList.contains() 的 O(n) 查找
+        Set<String> stcdSet = new HashSet<>();
+
+        BigDecimal totalTime = BigDecimal.ZERO;
+        String baseCode = "";
 
         for (MsThreedRoamEntity detail : threedRoamList) {
-            totalTime = totalTime.add(detail.getTime().multiply(new BigDecimal("0.2")));
+            totalTime = totalTime.add(detail.getTime().multiply(TIME_SCALE));
             lists.add(totalTime);
             lists.add(detail.getLgtd());
             lists.add(detail.getLttd());
             lists.add(detail.getDtmel());
             baseCode = detail.getCode();
 
-            if (StrUtil.isNotBlank(detail.getStcd()) && !stcdList.contains(detail.getStnm())) {
-                stcdList.add(detail.getStnm());
+            if (StrUtil.isNotBlank(detail.getStcd()) && stcdSet.add(detail.getStnm())) {
                 milestoneList.add(new String[]{detail.getStnm(), totalTime.toString()});
             }
         }