To judge whether a parameter to be tested locates in a given interval, the article constructs a kind of parameter hypothesis test model named duplex parameter hypothesis test model, which is based on the theory of the traditional single parameter hypothesis test. Firstly, the article establishes the duplex parameter hypothesis Test model and provides the solution of it. Secondly, the article analyses the estimation and distribution characteristics of probability of suspended depth charge intercepting tornado. The article furthermore applies the established model into the accreditation of a set of developed simulation system named ‘Digital Combat Simulation System of Suspended Depth charge intercepting Torpedo’. Also, the article constructs an accreditation index and provides the methods for accrediting the simulation system. At last, the article accredits the developed simulation system with the duplex parameter hypothesis test model, output data from the simulation system and the accreditation index. The result indicates that the accreditation index is lower than the given threshold. There is a high validity of the simulation system and it can be applied to the practical application.