In order to supply adaptive testing of electromagnetic environment(EME) for radio equipments with real scene, and further facilitate EME monitoring and evaluation, research on reconstruction of true circumstance of EME is carried out. According to the characteristics of true circumstance of EME, the system architecture of true circumstance is built and realized. The system architecture of generating system of true circumstance and key technologies are also discussed. The results show that it can help shorten test and experiment period, reduce the additional costs and serve radio management and monitoring better by building true circumstance of EME.