A novel adjustable pulse laser based on phase control of the coherent beam combination is proposed. Corresponding experiment setup with all fiber-based components is designed and manufactured. By controlling the phase difference of the two coherent beams which are coherently combined in a fiber coupler, pulse laser with adjustable repetition rate, pulse duration and duty cycle can be generated. In order to generate stable pulse, the close-loop control method is induced to compensate the phase difference noise. Different wave signals such as rectangular wave, sine wave, triangular wave have been used to modulate the phase difference in experiments, and corresponding pulse lasers are demonstrated. Rectangular wave signal with different parameters is used to modulate the phase difference in experiments, corresponding pulse laser with repetition rate from 1 kHz to 500 kHz and duty cycle from 20% to 80% can be generated. Pulse with 300 ns pulse duration can be demonstrated with repetition rate of 500 kHz. This pulse laser generate technique provides a new approach for the generation of high power, multi-parameter adjustable pulse laser.