The Wind turbine simulator (WTS) generally uses a simplified aerodynamic model (i.e.C_p-λ-βcurved surface) to simulate the aerodynamic characteristics of the rotor,which will not only affect the accuracy of aerodynamic torque,but also cannot reproduce the aero-elastic coupling characteristics of a large wind turbine.This paper analyzes the operating principle and program structure of FAST (Fatigue,Aerodynamics,Structures,and Turbulence),which is an open source wind turbine simulation software developed by the National Renewable Energy Laboratory (NREL).Then,the pneumatic calculation code in FAST is extracted and packaged,combined with the speed measured from WTS,the aero-elastic coupling simulation based on FAST is finally realized on WTS.As a result,the aerodynamic torque given by WTS is more credible and more data about aerodynamic loads can be achieved.At the end of this paper,experiments show that the WTS combined with FAST code can achieve a more realistic and comprehensive aerodynamic simulation.