In order to obtain higher resolution images of earth observation, we have to obtain more accurate satellite attitude, thus the measurement and processing of satellite high-frequency jitter must be solved.The four-mode differential laser gyro has the ability to measure the full-band jitter.Considering that the star sensors have the advantage of high measuring accuracy, we put forward a combined attitude determination program based on four-mode differential laser gyro and star sensor.The Kalman filter model of the combined attitude determination program was derived, which was then used for fusion filtering of four-mode differential laser gyro and star sensor measurement data.The simulation results show that the program achieves a broadband satellite micro-vibration measurement, and thus can obtain highly accurate satellite attitude.