Verification, validation and accreditation on digital simulation model

With the increasing of the complexity of the modeling and simulation(MS), the correctness and credibility of MS are very important. This article explains the operation methods of the model verification, validation and accreditation with some examples and analyses of the major factors that affect the accreditation and credibility of the simulation results. This article also discusses the significance of the research on simulation credibility and its relationship with modeling and simulation, explores the main problems and contents of the digital simulation credibility research. The results show that the main factors influenced simulation model is simulation modelling, in order to ensure the simulation model's correction, it is necessary to verificate, validate and accredit.