Abstract: According to the traditional pulse coding laser's technology status that its pulse repeating frequency coding can be easily in terfered,a new idea of laser pulse width coding was put forward applying pulse width tuning laser.For this reason,a kind of pulse width tuning laser realization project applying frequent electro-optic chopping wave technology was put forward.This kind of pulse coding laser was made up of seed laser,electro-optic chopping wave groupware and laser amplifier.The programm able controller was used to control the retard circuits to alter the electric pulse width on the pole of the Pocke ls cell, and then the output laser pulse could be tuned.The academic design of this pulse coding laser and its expermiental system were finished.The prmiary analysis approves the feasibility o f the project.