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In order to assess civil aircraft inertial navigation performance more effectively,do better analysis of its inertial data error compared with flight plan. Presents a new method for the overall analysis of inertial navigation error,make flight plan track discrete and calculate the error data,use multi-scale analysis method dividing error into two parts:high frequency coefficients and low frequency coefficients,change non-stationary low frequency coefficient into a stationary time series,eventually establish error data’s autoregressive moving average (ARMA) model. Through the practical quick access recorder (QAR) data validation,this model describes civil aircraft inertial navigation error and describe the trends more accurately. This method can be used to assess civil aircraft inertial navigation system performance.