Due to the relatively low sampling rate of current commercial polarization state analyzers,a specialized measurement system will need to be built with the use of high-speed real-time digital oscilloscopes if the detection of polarization state for a high-speed signal is required.At this point,the system calibration becomes particularly important,and the calibration method will directly decide the measurement accuracy.A calibration method is proposed for an optical fiber high-speed polarization state detection system.This method is theoretically analyzed by Mueller matrix,and then it is proved that the calibration method is feasible and accurate,of which the measurement error is less than ±3%.