In order to implement armament maintenance task scheduling quickly and effectively, reduce waiting time of armament in maintenance systems, and resume battle effectiveness as soon as possible, a general mathematical description and relative model of serial maintenance flow with multi-specialty and multi-combat-unit maintenance task scheduling are put forward. Based on maintenance flow, the armament maintenance task scheduling problem with serial flow and same order is expatiated and a hybrid genetic algorithm is presented to solve such problem. Experiments are carried out, and simulation results show that the method is effective to solve maintenance task scheduling problems in wartime.