Abstract: RCS dynamic measurement can obtain the target RCS in the real environment, which is one of the important means to study the characteristics of the target and the environment. Aiming at the problem that the RCS measurement data cannot directly correspond to the target measurement angle in the dynamic measurement of ship target RCS because of the attitude and position of the target are constantly changing, two methods for correcting the angle of the measurement data are proposed in this paper. The two methods use coordinate system conversion and angle calculation to obtain the time series of the measurement angle, and comprehensively process the time series of the RCS measurement data to obtain the corresponding relationship between the measurement data and the angle, which supports ship target RCS reduction and feature simulation research. The effectiveness and correctness of the proposed methods are verified by experiments.