According to the speed and coherence of robot fish’s heading ball in the underwater robot water ball game simulator 2D edition software platform, the robot fish’s attack and defend strategy will be optimized in snatching ball combat. To research the heading ball function in snatching ball combat and analyze the two robot fish’s collaboration capabilities in the first and second half will make the robot fish combining ‘static and dynamic’ so that our robot fish can keep the active situation while enemy robot fish have no good ball or even no ball to snatch. Living examples show that the strategy can make the robot fish get more balls.