In the simulation robot fish water ball 3vs3 game, for the deficiencies of the traditional defensive strategy, a new collaborative defensive strategy is introduced based URWPGSim2D simulation platform. On the basis of analysis of the problems of race strategy, the defense area is divided into the bottom line of the defense area and the absolute risk areas, in different regions with different defensive strategies, and three kinds of defensive situations that may arise based on the defensive side area targeted deployment analysis. The practical results show that the strategy has good results in applications.