Based on SST K-ω turbulent model, aerodynamic measures of 2D-corner-cutoff square cylinder were simulated under all yaw wind angles, at Re=5×10⁴.The aerodynamic coefficient, lift frequency spectrum, strouhal number were studied after adding aerodynamic measures,which showed good agreement with other experiment test. The research results show that when wind yaw angle α ≤ 25°,the lift coefficients show a decreasing trend and increase greatly after adding fins;α>25°,The lift coefficients are on the rise and aerodynamic measures can't influence it. Drag coefficient increase after adding aerodynamic measures and the minimum of drag coefficient is at α=5~10°. Different vortex shedding pattern include different vortex-shedding frequency when the wind yaw angle is changing and vortex shedding isn't always simple harmonic wave. St number will diminish after adding aerodynamic measures and the maximum St number is at α=5°~15°.