The robotics soccer game is a standard task platform, the soccer robot is one form of the artificial life body. Based on this platform, in terms of the action-selection model of artificial life, carries a comparable and valid study. Firstly, this paper analyses the action layer and the action type of the soccer robot. Then, according to the behavior selection model of artificial life body based on priority degree, improves the action selection model of the soccer robot. Finally, builds the decision-making system of soccer robot based on the model, and this system has been applied in the actual games of soccer robot, the result indicates that it is workable and efficient.