Abstract: 　　In order to improve the efficiency of overhaul and dismantling of hydroelectric unit equipment, a model and planning method for asynchronous parallel dismantling sequence planning of hydroelectric unit equipment were proposed. Firstly, a multi-level priority constraint model of components was constructed by disassembling the directed graph, and the mixed search strategy was used to obtain the set of parts to be disassembled. Then, a dismantling sequence programming model with the goal of minimizing parallel dismantling time is established, and an improved Humpback Whale Migration Algorithm (HWMA) based on adaptive strategy and local search mechanism is proposed. Finally, taking the overhaul of the turbine runner as
　　an example, the method is used to solve the asynchronous parallel dismantling sequence, and the experimental results and the analysis of the example prove that the method is feasible and effective. This method provides a new solution that can be generalized for the planning of equipment maintenance sequences of hydroelectric unit.