In order to investigate the influence of different cooling methods on cooling efficiency of center cone in turbo-fan engine，the physical models of components after low turbine are established in the paper, and distribution of temperature in cone is simulated and calculated by coupling method of fluid and solid, the study focused on the influence of cooling flux ratios and injection angle when different cooling methods are adopted. The results show that importing air to cavity cools cone efficiently except for middle section before double row holes，improving flux ratio in a certain range can improve the cooling effectiveness; compared with cooling by importing air to cavity, method that compound importing air to cavity and full coverage film cooling can reduce the temperature on middle section before double row holes by 40 percent while the flow ratio remains constant.