Abstract: In order to obtain the influence of different cold air parameters on the flow and temperature characteristics of the outer ring of a high-pressure turbine, heating and pressurization test methods were used to study the temperature field distribution and cooling efficiency of the outer ring under different cold air to gas flow ratios. The numerical simulation results were compared and analyzed with the experimental results. In addition, the influence of different gas inlet angle conditions on the flow heat transfer in the outer ring was numerically simulated. Results show that the numerical simulation results are in good agreement with the experimental results. The cooling efficiency results using temperature averaging at measure points are slightly higher than the experimental results. There is a clear separation and poor periodicity in the flow of the main gas flow in the outer ring test environment under the test conditions. By adding supporting elements on the sides of the outer ring block, the flow periodicity in the outer ring block area is effectively improved. When the inlet flow direction is consistent with the outlet flow direction of the gas film hole, the cold air coverage effect is better, and within a certain angle range, the impact on the cooling efficiency is relatively small. There is an optimal matching value between the inlet flow angle and the outlet flow direction of the gas film hole.