定义两个变量：

var
BackLeft,BackTop,I:integer;
//保存窗体的left
BackLeft := Left;
//保存窗体的top
BackTop := Top;
//其中number可由你设置一个灵活的数字,当然值由你定
for I:=1 to Number do
begin　
//水平抖动
Left:= (BackLeft-10) + (Random(20));
//垂直抖动
Top := (BackTop-10) + (Random(20));
end;
//备份窗体的left
Left := BackLeft;
//备份窗体的top
Top　:= BackTop;