Abstract:A hydraulic power control device for the particle impact drilling which could be used to realize even, stable and controllable injection of steel particle was developed to solve the problems existing in the particle injection system of the particle impact drilling system, such as the compact connection and narrow space between the highpressure tank and the screw conveyor, complexity of motor installation and vibration. The hydraulic system was designed, the key technical parameters of the hydraulic system were calculated and optimal power system equipment was selected. The laboratory experimental results show that, under the condition of 25 MPa in the barrel, the stable operation of the hydraulic power unit lasts for 240 minutes, which not only verifies that the hydraulic control system can provide effective power source, but also guarantees the stable, reliable operation of the particle driving device. Simultaneously, it is of great significance to the promotion and application of particle impact drilling technology in deep hard formation drilling site in our country.