Abstract:With the types, functions and structures of spacecraftpayloadsincreasingly complex,the requirements forthe performance of integratedsimulating and testing system are getting higher and higher.The payload integrated simulating and testing system is an important tool to carry out the payload system-level electrical performance test, the overallintegrated test and the launch field test.To meetthesimulating and testing requirements from different areas and different types of payload and to improve efficiency and adaptability of the system integrated test and verification,a design architecture of spacecraft payloads integratedsimulating and testingsystem with higher reliability, adaptability and scalabilityis proposed based on distributed high-performance computer network architecture. The system complies withthe design concept of strong cohesion and loose coupling, whose modules can be flexibly reorganized according to the testing requirements, and can be used in all stages of payload research and development with the advantages of high reliability, flexibility, fast reconstruction and extended upgrade.The functions, compositions and specific programs of all testing equipments in the payloadintegrated simulating and testingsystem are introduced in detail.