Calibration before launch for SINS is believed to be an important way to acquire high precision.Based on the feature of stable scale factor of RLG,an error parameter model of accelerometer components suitable for RLG SINS calibration before launch is presented.The influence of miniature attitude change caused by base disturbances on acceleration passage output is analyzed.The systematic calibration method for accelerometer components suitable for RLG SINS is designed. This method can suppress miniature attitude disturbances.Based on the observability analysis for error states,the systematic calibration method before launch is designed.The experiment results show that the new method can fast calibrate the error parameters of accelerometer components with a high degree of accuracy.