In order to study the effect of blade high harmonic pitch on hub vertical load, a dynamical model of vertical hub load under individual blade control is established. With the assumption of rigidly flapping blades, the Leishman Beddoes (L-B) unsteady dynamic model and the Glauert inflow model are introduced to calculate the rotor aerodynamic force, which is then substituted into the equation of blade flapping to solve the vertical hub load. In view of the variances of vertical hub load under 2Ω and 3Ωorder harmonic pitches, the influence law of vertical hub vibration load affected by the amplitude and phase of high harmonic pitch is finally summarized. Simulation results indicate that, the vertical hub vibration load can be effectively reduced by individual blade control.