For a long time，one of the petition letters’ functions is relief rights，and there are different types of disputes. With the development of petition letters，the uncertainty and fuzziness of accept range in petition letters don’t resolve the conflict effectively. So it is necessary to certain the range，distinguish the disputes，remove the disputes which should be resolved by other systems，and establish the appropriate model in resolving administrative dispute. Meanwhile，it is important to improve the whole systems，such as classification and distinguish of disputes，separating petition letters from litigation，ending of cases，information sharing. It is helpful to resolve the social conflict and dispute.