Temporal Blocked Nostrils

My nostrils are always blocked only one use to open and support me to breathe what should I do??
 
In the normal course, only one nostril is used at any given point of time. I presume you mean that one nostril always seems to be blocked. There could be several causes for chronic blocked nostrils. Common causes could be nasal allergy, a deviated nasal septum or a chronic infection. All of these can be corrected with appropriate medication. You must consult an ENT specialist to find out the cause of your blocked nostrils. Only then can appropriate treatment be prescribed.