I am graduate with arts and my interest is in computer so that i want to do mca from ignou .is it right selection for me or not.guide me

Yes, IGNOU would be a better options amongst all other providing distance education.

If you have interest in Computers then there is nothing in going out there for MCA. Its indeed a good thing to go for it. But before going there do R&D on what exactly are your interests in Computers because there are many things in IT Industry.