Abstract: Studies the rail pressure controll strategy and control parameters optimization of high pressure common rail diesel engine. Pressure control valves specialities and control parameters are analyzed. Influences of the single control frequency, pressure sampling period and the loop control interval period for rail pressure control are studied. Control strategies of target set-point rail pressure value and corrections at different working conditions are designed. And the rail pressure sampling, controlling and corrections strategies are tested on engine test bench. It was proved that the pressure sampling, controll strategies could control the rail pressure at any value on any engine working conditions, and fulfill the needs of the common rail diesel engine.