keep text formate in vim useing pietty copy-paste

From：How can I keep the code formated as original source when I paste them to vim?

When I copy some code from webpages and paste it to VIM,I find it becomes a mess style like a ladder as follows

xxxxxx
   xxxxxx
      xxxxxx
         xxxxxxxxxx

Since it messed so regularly so I think maybe there's something wrong with my .vimrc which is as below:

Answer：

Do this before:

:set paste

Then after:

:set nopaste