In view the problems of complex method, considering the problem of less scheduling rules and less practicability in current research of the maintenance task dynamic scheduling method, the dynamic scheduling method of maintenance tasks is optimized. First of all, considering scheduling rules of the maintenance time, waiting time before maintenance, the degree of enemy threats and equipment severity, the TOPSIS method used to determine the priority of the maintenance tasks. Then, the model of the dynamic scheduling of the maintenance task is established by live update the static scheduling scheme of the maintenance task at the critical time point in real time. Finally, the feasibility of the model is proved by the example analysis. The result shows that new model can solve complex problems in simple way, and provide reference for the equipment maintenance commander to determine the maintenance task scheduling scheme.