Aiming at a unit level BDAR (battlefield damage assessment and repair) action simulation training evaluation system, a selection method of simulation training evaluation index is proposed. Based on the analysis of specific BDAR tasks in different action phases, the task requirement system of the corresponding action deduction module is established according to the mapping idea of "task-requirement-index", and taking the training module of "Damage Assessment and Technical Inspection" as an example, on the basis of pre-selected indexes, the task requirement system of the corresponding action deduction module is established. The fuzzy clustering analysis model based on transitive closure method is used to select the evaluation index of BDAR capability, which is in line with expectations. The calculation results show that the mapping relationship between task and capability is established by the method, which is helpful to find the specific shortcomings of the ability to carry out the task in the evaluation, and can provide an effective reference for the evaluation of unit level BDAR training based on action simulation training.