The working principle and components of a new threecylinder hydraulic turbocharger which had novalve were analyzed. The relationship between the displacement of the cylinders and the angle of the inclined dial was studied.The torque of the inclined dial was reached by the dynamics analysis about the new hydraulic turbocharger.The torque curve of the inclined dial shows that when the pressure of supplied oil is equal, the torque of the inclined dial which is supplied by the cylinders is steady and continuous;the working of the new hydraulic turbocharger is continuous.