Abstract: In order to deal with the divergent unstable vibration of aeroelasticity,an equivalent sliding mode control（SMC） algorithms based on 2 D airfoil profile with chordwise rigid trailing-edge flap structure is proposed in this work,which can be applied in flutter suppression of wind turbine blade.Based on analysis of the elastic flap-wise/twist displacements,the structure model is incorporated into the angle control of trailing-edge flap.Aerodynamic expressions are based on the quasi-steady model which is attached to the influences of rotating trailing-edge flap.The SMC algorithms are investigated based on auxiliary feedback control and quadratic feedback control respectively,so as to realize displacement response analysis,velocity analysis,and display of angle input control of trailing-edge flap and sliding mode function.The feasibility of the hardware implementation of the control algorithm is verified by hardware-in-theloop simulation platform via OLE for process control（OPC）.