Abstract: The applied theory of the measurement on ultrashort pulse width shape and phase with a laser fiber gyro lens is introduced;By using the fiber gyro lens as a optical delay line which can adjust rotating angular velocity automatically,we can realize the arbitrarily continuous adjustment of rotaing angular velocity.With the normalized algorithm of Gerchberg-Saxton,we can realize the process control automation.In this way we overcame the shortcoming of low veracity and limited precision caused by fixed time-delay;By using the single-photon counter system to test the envelope of coherent light,the precision improved greatly.THe application foreground on physics,biology,chemistry and overspeed optic communication is widened by the research.