The feasibility of simulation models is generally verified by the personal experience. However, the process usually introduces missing indicators and inconsistent results, which greatly enhance the difficulty in evaluating the reliability of the simulation model. In this paper, taking the aircraft landing gear system as an example, a new framework for the accurate validation of the simulation model is proposed. First, the indicators of model validation are established considering the product requirements. Second, each indicator is verified based on the requirements of validation accuracy. Third, the reliability of the simulation model is evaluated considering the importance of each indicator to the model.