diff --git a/kongjian7.m b/kongjian7.m
index 651cb33..ec9562a 100644
--- a/kongjian7.m
+++ b/kongjian7.m
@@ -2,4 +2,8 @@ fig=figure('Position',[20,20,400,150]);
 hsli1=uicontrol(fig,'Style','slider','Position',[50,50,120,20],'Min',200,'Max',800,'Value',400,...
     'Callback',['set(azmcur,''String'','...
     'num2str(get(hsli1,''Value'')));'...
-    'set(gcf,''Position'',[20,20,get(hsli1,''Value''),300]);']);
\ No newline at end of file
+    'set(gcf,''Position'',[20,20,get(hsli1,''Value''),300]);']);
+hsli2=uicontrol(fig,'Style','slider','Position',[240,50,120,20],'Min',100,'Max',600,'Value',300,...
+    'Callback',['set(elvcur,''String'','...
+    'num2str(get(hsli2,''Value'')));'...
+    'set(gcf,''Position'',[20,20,400,get(hsli2,''Value'')]);']);
\ No newline at end of file