Shree,
While you can choose to make the Administrative Distance to almost any number you choose, you should have a good reason for changing, and you should make the change across all routers under your control that use the protocol in question. There are legitimate circumstances where you need to change an AD (often times with multiple redistribution points), but in general this is not done.
The AD number acts as a sort of ranking on how trustworthy the information is from the routing protocol. For example, OSPF routes (AD = 110) are considered far more trustworthy than Internal BGP routes (AD = 200).