As a typical kind of preamplifier with extremely high gain,regenerative amplifier is very important in the field of obtaining ultra-short high-energy laser pulses.In this paper,an improvement on the traditional regenerative amplifier was introduced.The usual pulse picker was taken out,and its function was integrated into the stage of amplifying by the optical configuration design and the precise control of time，and the result of the experiment proved that this kind of improvement was absolutely feasible.