The active utilization of the pressure rise phenomenon of an oil hammer and a new type of hydraulic pressure intensifier using an oil hammer are proposed. In this paper, application of this intensifier to the hydraulic motor is studied through experimentation and simulation. The influence of the volume at the hydraulic motor entrance on the rotation angle and the pressure change is tested. The rotation angle of the hydraulic motor is made to follow up the desired value using a technique similar to that of PWM control. The relation between the rotation angle of the hydraulic motor and the pulse width for opening and shutting the solenoid-operated valve to generate an oil hammer is measured. Using the result, the rotation angle of the hydraulic motor is controlled to follow up the desired value. The influence of the load torque on te follow-up control and the efficiency is examined.