In order to further improve the energy harvesting efficiency of vertical axis wind turbines in complex urban wind farms with low wind speeds,a combination of CFD numerical calculations and Taguchi experiments was used to systematically study the effects of solidity(σ),pitch angle(β),damping(Cd) and density ratio(ρ*) on the aerodynamic performance of a five-blade vertical axis wind turbine(VAWT). The rotational control equations of wind turbine with the control equations of flow field were solved jointly,and the interaction between the wind turbine and the fluid in numerical calculations was considered.The research results show that the change of solidity,pitch angle,damping,and density ratio have a significant impact on the aerodynamic performance of a vertical axis wind turbine.Under the optimal parameter combination,the energy harvesting efficiency of the five-blade VAWT can reach 13.537%.Furthermore,by analyzing the results of the Taguchi test,the influence degree of the four characteristic parameters studied on the aerodynamic performance of wind turbines is as follows:σ＞Cd＞β＞ρ*.