In order to improve the quality of radar detection missile target data in radar detection accuracy evaluation, the mean and median elimination method based on sliding window is proposed, and it is compared with the polynomial fitting method and template convolution method based on sliding window. By taking three times of the mean square error as the threshold and setting the appropriate window length, the mean or median elimination method based on window sliding is selected. The test results show that the 2 methods can effectively eliminate the outliers in the radar detected missile target data, and provide effective support for the subsequent trajectory restoration and data evaluation.