Ajith, mod security  is server setting. Please contact your hosting company to find out where and how you can enable/disabled it ( if they allow this at all).

i was told them they told me they cant disable please contact the developers  and make something on script

Ajith, it is not possible to enable/disable mod_rewrite within the script.

Your host probably meant that if something is being blocked by mod_security, then this "something" needs to be either disabled or changed in the script.

But it is not clear what your host is blocking. We need more details to help you.

they told me now am in shared hosting and they are have more  site and some sites facing hacking and they enable mod security