The wind turbine blade vibration is a serious problem not only because it reduces the life span of blades, it can also pass undesirable disturbance frequencies to the tower, which causes tower to vibrate. The aim of this paper is to develop a model for wind turbine flapwise vibration and reduce blade vibration caused by pitching command. Lagrange’s method is used to establish the governing equations and input shaping method is used to reduce the residual vibrations caused by the change of pitch angle input. The model we developed is compared with the model in FAST and the effectiveness of input shaper is verified by comparing the response of the model with input shaper and without input shaper.