Problems and difficulties of testing armored vehicle power train were discussed in this paper. A computing model of the flywheel, the conne ction of the engine and the transmission of a amored vehicle, was established by using the finiteelement method, which met the requirement of load spectrum of power outputtorgue under different running conditions. An outputtorgue test ing method was put forward using the structure of the flywheel, and a device of measuring outputtorque in a restricted space based on the shortrange wireles s telemeter technology was developed. The power outputtorque signals were acq uired under several working conditions and were analyzed by a software of armore d vehicle load spectrum developed for this study, which resulted in some valuable load spectrum data.