diff --git a/Project2.vcxproj b/Project2.vcxproj
index 9556046..612c51f 100644
--- a/Project2.vcxproj
+++ b/Project2.vcxproj
@@ -21,6 +21,7 @@
   <ItemGroup>
     <ClCompile Include="array_queue.c" />
     <ClCompile Include="array_stack.c" />
+    <ClCompile Include="binary_tree.c" />
     <ClCompile Include="linked_list.c" />
     <ClCompile Include="linked_list_stack.c" />
     <ClCompile Include="linked_queue.c" />
@@ -30,6 +31,7 @@
   <ItemGroup>
     <ClInclude Include="array_queue.h" />
     <ClInclude Include="array_stack.h" />
+    <ClInclude Include="binary_tree.h" />
     <ClInclude Include="linked_list.h" />
     <ClInclude Include="linked_list_stack.h" />
     <ClInclude Include="linked_queue.h" />
diff --git a/Project2.vcxproj.filters b/Project2.vcxproj.filters
index 652c5cc..be6bba5 100644
--- a/Project2.vcxproj.filters
+++ b/Project2.vcxproj.filters
@@ -36,6 +36,9 @@
     <ClCompile Include="linked_queue.c">
       <Filter>源文件</Filter>
     </ClCompile>
+    <ClCompile Include="binary_tree.c">
+      <Filter>源文件</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="sq_list.h">
@@ -56,5 +59,8 @@
     <ClInclude Include="linked_queue.h">
       <Filter>头文件</Filter>
     </ClInclude>
+    <ClInclude Include="binary_tree.h">
+      <Filter>头文件</Filter>
+    </ClInclude>
   </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/binary_tree.c b/binary_tree.c
index 825c22f..94397ba 100644
--- a/binary_tree.c
+++ b/binary_tree.c
@@ -41,7 +41,8 @@ void traverse_tree(tree_node *roots)
         printf("error: roots is NULL\n");
         return;
     }
-    while(roots)
+    printf("%d\n", roots->value);
+    while(roots ->left !=  NULL && roots -> right != NULL)
     {
       tree_node *temp[2] = {roots->left,roots->right};
       for (int i = 0;i<2;i++)
@@ -53,6 +54,7 @@ void traverse_tree(tree_node *roots)
             printf("%d ",temp[i]->value);
             }
         }
+       printf("\n");
        roots = queue[front];
        front = (front+1) % 3;
     }