Aiming at the phenomenon of residual error after system error correction for radio measurement information, for optimi-zation of trajectory result, the effect of each residual error on trajectory calculation was analyzed in detailed, residual errors from different source were linearly decoupled, the analytic relation of measurement information's residual error to trajectory calculation was set up by limited variation technique The above-mentioned ways were used for analyzing the true metrical data and the way was found can better reflect the sensitivity effect of residual error to trajectory, sufficiently supporting equipment to eliminate system bias and improve the precision of data processing result effectively.