At the time of intercourse i m not able to discharge sperms in quantity and organ getting loose after course of 5-10 minutes, but at time masterbation i can discharge sperms. is there any problem ?

Looks like a problem: Since a goal of a man is to "discharge sperm" during intercourse (if he's trying to have children), the inability to do so is indeed a problem. The fact that he can "discharge sperm" during masturbation is a good sign, as it shows that his plumbing can function properly (just not in the desired situation). A primary care doctor, a urologist, and maybe a psychologist can help rid this problem.