Abstract: Aiming at the problem of yaw brake instability of wind turbine,the yaw brake stability analysis was carried out based on ABAQUS software. The influence of braking pressure,friction coefficient,yaw speed,elastic modulus and slotting mode on braking stability was analyzed by using complex eigenvalue analysis and instability tendency coefficient TOI value. Based on the full factor test and Design-expert software,the TOI value response surface model of the instability tendency coefficient was established,and the relevant parameters were optimized. The results show that the friction coefficient,the elastic modulus of yaw brake cylinder and the elastic modulus of friction plate have significant influence on the braking stability. The friction plate with double groove has significant influence on the braking stability,while thesingle groove has a little influence. Braking stability is little affected by braking pressure and yaw speed. The braking instability coefficient of yaw brake after parameter optimization is reduced by 73.7%. The research conclusion can provide theoretical guidance for the design and development of yaw brake.