Abstract: How to improve quickly the reliability of system and prove to be the minimal instruments in the parallel connection have been a long hotter topics in the research of reliability of system. The same problems from the starting of any state (k1,k2,…,kn) are discussed in this paper. It is has proved that the reliability of system get the most quick improvement from the system state (k1,k2,…,kn) if the same instruments is parallel to the subsystem made up of the parts of the reliability. Meanwhile, the algorithm and example are given.