For phase-shifted full bridge current-doubler rectifier circuit of high-power laser constant current drive power,small signal equivalent model is established by state space average method. Based on this,the closed-loop control system was studied. The integrated control chip UCC28950 was used to the actual control circuit. According to automatic control principle,the compensation network of the closed-loop control system was designed by Matlab,which makes the constant current supply has good transient dynamic characteristics an anti-interference.