The analysis of aircraft dynamic radar cross section (RCS) is capable of providing an important theoretical support for aircraft stealth design and test evaluation. The shortcomings of current dynamic RCS modeling and simulation are analyzed. Aimed at the problem that the existing dynamic RCS calculation method is simply applied to finite angle domain, the definition of radar azimuth in the aircraft system is modified, and the scope of application of existing methods is expanded. In the existing methods, a oneto-one mapping relationship between the radar line-of-sight angle and the aircraft RCS value cannot be established,and a new dynamic RCS calculation method is proposed. This method is to use the dynamic RCS value of the aircraft characterized by the Euler rotation angle in the aircraft body coordinate system and in the radar irradiation coordinate system, and has higher accuracy in the comparison with the traditional method. The simulation verifies that when an aircraft is in a maneuvering state, the results of the new dynamic RCS calculation method are significantly different from those of the existing methods, and such method effectively improves the accuracy of the dynamic RCS calculation.