Abstract: In the paper,the algorithm drifts of SINS mathematical platform caused by the base coning motion are analyzed in detail.A new scheme for optimizing the five-sample and six-sample rotation vector algorithms are proposed,which are realized by solving the equations.The comparisons among four-sample,five-sample and six-sample rotation vector algorithm drifts are made.The results show that the six-sample rotation vector algorithm improve the coning compensation accuracy,compared with four-sample,five-sample rotation vector algorithm.