In the process of conventional magnetic anomaly processing, it can be assumed that there is no residual magnetization, and the self demagnetization effect can be ignored, so the direction of the total magnetization is consistent with that of the contemporary geomagnetic field. However, due to the existence of residual magnetization, the direction of total field magnetization can be completely different from that of induced magnetization, which affects the processing, inversion and interpretation of magnetic survey data. Based on this,a method of L-modulus and magnetopolarizing anomaly (RTP) cross-correlation is proposed to estimate the magnetization direction. Theoretical model tests show that this method is more accurate than conventional methods in estimating the magnetization angle, and has stronger practical applicability and stability.