This paper constructs a simulation model for the equipment battlefield repair process under the ExtendSim simulation platform to study the impact of various maintenance support resource elements in the equipment battlefield repair process. A conceptual model of the equipment battlefield repair process was constructed； the modeling boundary was analyzed and a simulation model based on ExtendSim was constructed. On this basis， simulation was conducted on the battlefield repair process of equipment. Through analysis， it is believed that under certain simulation conditions， there is an optimal number of testing personnel and equipment， which results in relatively stable equipment utilization， support personnel utilization， task waiting time， and average task completion time， without consuming excessive maintenance resources. When the number of inspection personnel and equipment is too small， the simulation system runs extremely unstable， sometimes even unable to complete the simulation process. Conversely， an excessive number of inspection personnel and equipment does not significantly improve maintenance efficiency. The impact of equipment heavy-damage rates on the repair process is also studied. The research results of this article aim to provide technical support for the organizational decision-making process of equipment battlefield repair.