Abstract: The orbit prediction plays a significant role in the scientific mission of remote sensing satellite. To obtain the longperiod and highprecision orbit prediction, the orbit forecast is performed by a dynamic fitting method. To analyze the effect of orbital height and different fitting arc lengths on the accuracy of orbit forecast, the data of the GRACEA satellite,HYA satellite, Jason2 satellite are used as examples. From the results, it is concluded that the prediction orbit of 3D RMS of 4 h and 8 h arc length of GRACEA satellites,the results are better than 3 m and 10 m respectively; for HY2A and Jason2 the 4 h arc length prediction results are less than 2 dm and 1 dm separately, 24 h arc length prediction results are better than 2.5 m and 2 m respectively.