hello all!
i am building inverter for approx 300 watts can anyone guide me how to design inverter through mosfet and i want to build with the help of pic...plz suggest me circuits build through mosfet n pic

 

After giving you the circuit, shud we make the code too. For Ur convenience.

 

You seem to have several other "inverter" related threads going:
http://forum.allaboutcircuits.com/showthread.php?t=55114
http://forum.allaboutcircuits.com/showthread.php?t=55057
http://forum.allaboutcircuits.com/showthread.php?t=55233

Isn't just one thread sufficient?