A strategy based on area division is proposed in order to resolve a route-planning problem persistent in ball-scrambling competition. According to features of this program allows us to divide the whole competing pool into three sections-defending, offending and pilfering area. Primarily the ball area, then judge the robot fish area and the robot fish carries out related action strategy. The test results show that the strategy can be implemented, which turns out to be of great efficiency and convenience. This strategy proved to be highly feasible in the International Under-Water Robot Competition serves as the cornerstone of goal scoring.