提出了一种测量群延迟的新方法,利用白光干涉仪产生的光谱干涉,通过时间频率联合分析直接得出群延迟,减小了传统相位差分方法产生的误差,并通过测量结果减去系统背景,进一步提高了光学元件色散测量的准确度.该方法适合于具有复杂色散光学元件群延迟和色散的准确测量,也适合于慢光器件群速度延迟的测量. A new method to measure the group delay is proposed. By using the spectral interference generated by the white light interferometer, the group delay can be directly obtained through the time-frequency joint analysis, the error caused by the traditional phase difference method can be reduced, and the system background can be subtracted from the measurement result , Which further improves the accuracy of optical element dispersion measurement.The method is suitable for the accurate measurement of group delay and dispersion with complex dispersion optical elements and also for the measurement of group velocity retardation of slow optical devices.