A novel pitch control system is proposed for wind turbine to stabilize the drive-train power and torque fluctuations. This system is based on a constant pressure network and a hydraulic motor with variable displacement. The desired pitch control motions and directions can be achieved by regulating the displacement of the hydraulic motor to adapt to the varying loads acting on the blade. Mathematical model and a detailed analysis for the control characteristics of the system are provided. Further, a double control loop for position feedback is proposed to accurately track the desired pitch angle which is obtained based on fuzzy reasoning. Experimental results have demonstrated that this system can effectively control the power and driver torque, and consequently maintain the output power and torque on the rated values. In addition, this novel system has the advantages of high power versus volume, energy-saving and is particularly suitable for large scaled individual pitch controlled wind turbine.