In this paper,we use the Bertrand model and Lotka-Volterra model to analyze China Mobile and China Unicom subscriber mechanism for the evolution of competition.We found that Lotka-Volterra is more appropriate.Then we use Lotka-Volterra model to discuss the subscriber dynamic evolution and the stability of the two companies.We found that the subscriber numbers of the two companies depend on the intent of the users.The future subscriber number of the two companies will reach a balance at 386.545(million) and 158.286(million).Technical cooperation can increase in the number of two companies'subscribers.