diff --git a/src/main/java/com/yame/Graph.java b/src/main/java/com/yame/Graph.java
index 7fa3430..4fbeaea 100644
--- a/src/main/java/com/yame/Graph.java
+++ b/src/main/java/com/yame/Graph.java
@@ -1,12 +1,83 @@
 package com.yame;
 
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+
+import com.mxgraph.io.mxCodec;
+import com.mxgraph.model.mxGraphModel;
+import com.mxgraph.model.mxIGraphModel;
+import com.mxgraph.util.mxXmlUtils;
+import com.mxgraph.view.mxGraph;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.w3c.dom.Document;
+import org.w3c.dom.Node;
 
 /**
  * Graph
  */
 public class Graph {
 
-    public void load() {
-        
+    private final Logger log = LoggerFactory.getLogger(Graph.class.getName());
+
+    mxGraph graph;
+    mxIGraphModel imodel;
+    mxCodec codec;
+
+    public static Graph Merge(Graph g1, Graph g2) {
+
+        Graph graph = new Graph();
+        mxGraph mg1 = g1.getMXGraph();
+        mxGraph mg2 = g2.getMXGraph();
+
+        for( Object cell: mg1.getChildCells(mg1.getDefaultParent())) {
+            graph.getMXGraph().addCell(cell);
+        }
+
+        for( Object cell: mg2.getChildCells(mg2.getDefaultParent())) {
+            graph.getMXGraph().addCell(cell);
+        }
+
+        return graph;
+    }
+
+    private void loadString(String xmlString) {
+
+        codec = null;
+        imodel = new mxGraphModel();
+        graph = new mxGraph(imodel);
+
+        Document doc = mxXmlUtils.parseXml(xmlString);
+        codec = new mxCodec(doc);
+        Node dmodel = doc.getElementsByTagName("mxGraphModel").item(0);
+        codec.decode(dmodel, imodel);
+
+    }
+
+    public void load(String pathStr) throws IOException {
+
+        Path path = Paths.get(pathStr);
+        String xmlString = Files.readString(path);
+        loadString(xmlString);
+
     } 
+
+    public void load(byte[] xmlBytes) {
+
+        loadString(new String(xmlBytes));
+
+    }
+
+    public mxGraph getMXGraph() {
+        return this.graph;
+    }
+
+    public String dumpModel() {
+
+        return mxXmlUtils.getXml(codec.encode(imodel));
+
+    }
 }
\ No newline at end of file
diff --git a/src/test/java/com/yame/GraphTest.java b/src/test/java/com/yame/GraphTest.java
index 5b81bf3..ab8110a 100644
--- a/src/test/java/com/yame/GraphTest.java
+++ b/src/test/java/com/yame/GraphTest.java
@@ -1,22 +1,12 @@
 package com.yame;
 
-import java.io.File;
-import java.io.FileInputStream;
-import java.io.FileOutputStream;
-import java.nio.file.Files;
-import java.nio.file.Path;
-import java.nio.file.Paths;
+import static org.junit.Assert.assertTrue;
 
-import com.mxgraph.io.mxCodec;
-import com.mxgraph.util.mxXmlUtils;
-import com.mxgraph.view.mxGraph;
+import java.io.IOException;
 
 import org.junit.Test;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
-import org.apache.log4j.*;
-import org.w3c.dom.Document;
-import org.w3c.dom.Node;
 
 /**
  * GraphTest
@@ -27,21 +17,28 @@ public class GraphTest {
     private final Logger log = LoggerFactory.getLogger(GraphTest.class.getName());
 
     @Test
-    public  void TestCase1() {
-        mxGraph graph = new mxGraph();
-        Path path = Paths.get(AppTest.testPath + "1.xml");
-        try {
-            String xmlString = Files.readString( path );
-            Document doc = mxXmlUtils.parseXml(xmlString);
-            mxCodec code = new mxCodec(doc);
-            Object a = code.decode(doc.getParentNode());
-            log.debug(a.toString());
-            // log.debug(mxXmlUtils.getXml( a));
-        } catch (Exception e) {
-            // e.printStackTrace();
-            log.error("Case1", e);
-        }
-        
+    public void TestLoad() throws IOException {
+
+        Graph graph = new Graph();
+        graph.load(AppTest.testPath + "1.xml");
+        assertTrue(graph.dumpModel().startsWith("<mxGraphModel>"));
+        graph.load(graph.dumpModel().getBytes());
+        assertTrue(graph.dumpModel().startsWith("<mxGraphModel>"));
+
+    }
+
+    @Test
+    public void TestMegre() throws IOException {
+
+        Graph graph = new Graph();
+        graph.load(AppTest.testPath + "1.xml");
+        Graph g = Graph.Merge(graph, graph);
+        log.debug(g.dumpModel());
         
     }
+
+    @Test
+    public void TestCase1() {
+    }
+
 }
\ No newline at end of file