diff --git a/src/main/java/com/gis3c/ol/dao/SourceDao.java b/src/main/java/com/gis3c/ol/dao/SourceDao.java
index 66002a0..5aa5be1 100644
--- a/src/main/java/com/gis3c/ol/dao/SourceDao.java
+++ b/src/main/java/com/gis3c/ol/dao/SourceDao.java
@@ -4,6 +4,7 @@ import com.gis3c.common.persistence.annotation.C3olDao;
 import com.gis3c.ol.entity.Source;
 import org.apache.ibatis.annotations.Param;
 
+import java.util.Collection;
 import java.util.List;
 import java.util.Set;
 
@@ -18,6 +19,7 @@ public interface SourceDao {
             @Param("currentPage") Integer currentPage);
     public Source findSourceById(String sourceId);
     public Source findSourceByName(String sourceName);
+    public List<Source> findSourceByType(String[] sourceTypes);
     public Integer insertSource(Source source);
 
     public Integer deleteSourcesById(Set<String> sourceIds);
diff --git a/src/main/java/com/gis3c/ol/entity/Layer.java b/src/main/java/com/gis3c/ol/entity/Layer.java
index 7409b3f..0074a88 100644
--- a/src/main/java/com/gis3c/ol/entity/Layer.java
+++ b/src/main/java/com/gis3c/ol/entity/Layer.java
@@ -126,5 +126,27 @@ public class Layer {
         this.description = description;
     }
 
+    public String[] PossibleSourceType(){
+        String[] sourceTypeArray = null;
+        switch (this.getType()){
+            case "ol.layer.Tile":
+                sourceTypeArray = new String[]{"ol.source.TileSuperMapRest","ol.source.WMTS","ol.source.TileArcGISRest"};
+                break;
+            case "ol.layer.Image":
+                sourceTypeArray = new String[]{"ol.source.Image"};
+                break;
+            case "ol.layer.Vector":
+            case "ol.layer.Heatmap":
+                sourceTypeArray = new String[]{"ol.source.Vector"};
+                break;
+            case "ol.layer.VectorTile":
+                sourceTypeArray = new String[]{"ol.source.VectorTile"};
+                break;
+            default:
+                sourceTypeArray = new String[]{};
+                break;
+        }
 
+        return sourceTypeArray;
+    }
 }
diff --git a/src/main/java/com/gis3c/ol/service/SourceService.java b/src/main/java/com/gis3c/ol/service/SourceService.java
index f88c1f9..baae786 100644
--- a/src/main/java/com/gis3c/ol/service/SourceService.java
+++ b/src/main/java/com/gis3c/ol/service/SourceService.java
@@ -1,6 +1,8 @@
 package com.gis3c.ol.service;
 
 import com.gis3c.ol.entity.Source;
+
+import java.util.Collection;
 import java.util.List;
 import java.util.Set;
 
@@ -12,6 +14,9 @@ public interface SourceService {
     public List<java.util.Map<String,Object>> findSourcesByPage(Integer pageSize,Integer currentPage);
     public Source findSourceById(String sourceId);
     public Source findSourceByName(String sourceName);
+    public List<Source> findSourceByType(String[] sourceTypes);
+
+
     public Integer insertSource(Source source);
 
     public Integer deleteSourcesById(Set<String> sourceIds);
diff --git a/src/main/java/com/gis3c/ol/service/impl/SourceServiceImpl.java b/src/main/java/com/gis3c/ol/service/impl/SourceServiceImpl.java
index f5b8a0a..59287a1 100644
--- a/src/main/java/com/gis3c/ol/service/impl/SourceServiceImpl.java
+++ b/src/main/java/com/gis3c/ol/service/impl/SourceServiceImpl.java
@@ -9,10 +9,7 @@ import com.gis3c.ol.service.SourceService;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
 
-import java.util.ArrayList;
-import java.util.List;
-import java.util.Set;
-import java.util.UUID;
+import java.util.*;
 
 /**
  * Created by hukekuan on 2017/12/15.
@@ -51,6 +48,11 @@ public class SourceServiceImpl implements SourceService {
         return sourceDao.findSourceByName(sourceName);
     }
 
+    @Override
+    public List<Source> findSourceByType(String[] sourceTypes) {
+        return sourceDao.findSourceByType(sourceTypes);
+    }
+
     @Override
     public Integer insertSource(Source source) {
         source.setSourceId(UUID.randomUUID().toString());
diff --git a/src/test/java/com/gis3c/spatial/App.java b/src/test/java/com/gis3c/spatial/App.java
index 7658c20..068e12a 100644
--- a/src/test/java/com/gis3c/spatial/App.java
+++ b/src/test/java/com/gis3c/spatial/App.java
@@ -29,9 +29,35 @@ public class App {
         MapService mapService = context.getBean(MapService.class);
         TestService testService = context.getBean(TestService.class);
 
+        List<String> list = Arrays.asList(new String[]{"a","b","c"});
 
-        Layer layer = layerService.findeLayerById("d804360f-eb5f-4e29-94ab-fdafbf224e02");
-        System.out.println(layer.getExtent());
+        list.stream().forEach(u -> {
+            if("a".equals(u)){
+                System.out.println(u.toUpperCase());
+            }else {
+                System.out.println(u);
+            }
+        });
+
+
+
+//        List<Source> sourceList = sourceService.findSourceByType(new String[]{"a","b","c"});
+
+//        System.out.println(sourceList);
+//        sourceList.forEach(u -> System.out.println(u));
+
+//        String source = Optional
+//                .ofNullable(layerService.findeLayerById("d804360f"))
+//                .map(layer -> layer.getSource())
+//                .orElse("");
+//
+//        System.out.println("".equals(source));
+
+
+
+
+//        Layer layer = layerService.findeLayerById("d804360f-eb5f-4e29-94ab-fdafbf224e02");
+//        System.out.println(layer.getExtent());
 
 //        Source source = sourceService.findSourceByName("cva");
 //        System.out.println(source.getOptions());
diff --git a/src/test/resources/mappings/ol/SourceDao.xml b/src/test/resources/mappings/ol/SourceDao.xml
index a606551..239e166 100644
--- a/src/test/resources/mappings/ol/SourceDao.xml
+++ b/src/test/resources/mappings/ol/SourceDao.xml
@@ -42,6 +42,16 @@
 		FROM c3gis_ol_source
 		WHERE sourceName = #{sourceName, javaType=java.lang.String};
 	</select>
+	<select id="findSourceByType" resultMap="sourceResult" parameterType="java.util.Set">
+		SELECT
+		<include refid="sourceColumns"/>
+		FROM c3gis_ol_source
+		WHERE type in
+		<foreach collection ="array" item="item" index="index" open="(" separator="," close=")">
+			#{item, javaType=java.lang.String}
+		</foreach>
+		ORDER BY type;
+	</select>
 
 	<insert id="insertSource" parameterType="com.gis3c.ol.entity.Source">
 		INSERT INTO c3gis_ol_source(sourceId