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We propose and numerically simulate a time-spectrum coding method to measure the fine structure of long pulses.By a difference-frequency (DF) interaction between the pending-measured long pulse and a linearly chirped pulse,the spectrum of the generated DF pulse contains the intensity information of the pending-measured pulse and the frequency information of the linearly chirped pulse.The numerical simulation results show that the fine structure of the pending-measured pulse can be derived from the spectra of the DF pulse and the linearly chirped pulse.