The star sensor is currently the most precise attitude measurement instrument. In the field of missile guidance，the star guidance technology utilizes the star sensor to correct the missile’s attitude error and improves the accuracy of the missile’s landing point. The high-precision missile guidance requires higher accuracy requirements for the star sensor’s measurement. The research status of high-precision star sensors at home and abroad is introduced in this paper. The error tree of the star sensor is given，the errors of the star sensor’s error tree are classified，and the sources of each error item in turn is analyzed. Finally，the methods to suppress the errors of the star sensor is proposed，including temperature compensation，filtering，inertial assistance，and optical zone calibration，with the aim of providing relevant ideas for the design of highprecision star sensors.