In order to accomplish the task of the equipment repair, according to the distinguishing of depot-level maintenance of equipment in war, this paper proposes a mathematical model of the division of operations in wartime equipment maintenance. Based on many types of multi task repair operations division, it puts forwards repair operations division problem solving scheme with time window. According to the model, using the characteristics of genetic algorithm, integrating the background of the problem and algorithm, this paper tests and analyzes an instance. The results show that the proposed method can effectively solve the wartime maintenance operations and division of optimization problems.