I want to subscibe any monthly martial arts magazine. Could you recommend one of the popular magazine in the world?.

Not Black Belt. That magazine is horrible.

Iam from india. Where can i find this magazine?. Iam not heared this magazine yet.

I really like 'Classical Fighting Arts'. It's very focused on karate. Not sure if you can get it where you are, or if there is an online version available. Here is their site:

http://www.dragon-tsunami.org/Cfa/Pages/cfahome.htm

I also like the 'Journal of Asian Martial Arts'. It's a little too diverse in topics for my taste...but I have an interest in that one as my teacher's teacher has written a few karate articles in the past.

http://journalofasianmartialarts.com/cms2/

And this is my favorite online (and free!) magazine:

http://www.meibukanmagazine.org/

Ditto on the Journal and Classical Fighting Arts.
CFA is the only martial arts magazine that I have ever subscribed to.
I do like to go to Borders and read the KungFu magazines.I even pick up Black Belt Magazine just to see what's in it but I would certainly never pay for a copy of Black Belt. The word "crap" doesn't even begin to describe it.

Fighting Arts International was one of the best at one time. I believe there is a plan to bring it back. Try this site for details,

http://www.terryoneills-fai.com/

Try Masters Magazine. It's a relatively new Quarterly publication but it includes a DVD w/ every issue.

http://www.mastersmag.com/

BTW - I wrote the "Nikkei Games" article for the current issue.

The monthly Martial Arts Standard magazine, with Gavin King as regular columnist and me as editor, you can subscribe here
http://www.martialartstandards.org/magazine