In the process of detecting the phase performance of the quiet zone in a compact range, it is necessary to eliminate the influence of the detection system on the measurement results in order to obtain the true performance of the site. Studies have shown that the detection phase error is caused by the installation offset of the scanning frame and the offset of the detection plane, and it exhibits certain regularities. In this paper, the installation offset of the scanning frame and the offset of the detection plane are calculated based on the phase measurement results of different sections of the quiet zone, and then compensation and correction are performed to eliminate the influence brought by the deviation of the detection system's measurement trajectory from the ideal path. This method is simple, reliable, and capable of obtaining real and effective detection results, which has been applied to the performance detection of the quiet zone in a compact range.