Abstract: The thought that policy stability reflects the Party's stability is an important aspect of Deng Xiaoping's policy idea as well as his stability idea. Policy stability has a close relationship with the Party's construcions of thought, politics,organization,style and system,-it also promotes the Party's stability. Their mutual relation is like this:policy stability reflects the Party's stability; while the Party's stability is benificial to policy stability and at the same time is a refleciton of the stability of the policy.