Abstract: The error correction of three-axis magnetometer measurement is of great importance to satellite attitude determination and control. In this paper, the error sources of three-axis magnetometer measurement are theoretically analyzed. Considering the case of constant shift caused by the magnetic input, an error correction model is proposed, with which the three-axis magnetometer HMR2300R made by Honeywell is calibrated and tested in a magnetic simulator. The experimental results show that the error of the three-axis magnetometer measurement can be controlled within 50 nT with the proposed method, which can meet the application requirements for low cost sensors in attitude determination and control of micro-satellites.