A new evaluation method using the maximal matching principle as the substation training simulator is proposed based on an analysis of the difference between the dispatcher training simulator evaluation and substation training simulator evaluation. The longest common sequence resolved by the dynamic programming algorithm is incorporated in the evaluating method， including such steps as setting the correct answer， manual coding， auto-coding， auto-comparison， auto-coloring， and automatic scoring. The method is capable of reducing the workload of trainer evaluation and guaranteeing impartiality. The analysis shows that the method proposed is applicable to most of the training simulator teaching plans. It is shown by practice that the method is ideally practical for substation training simulator evaluation.