Abstract: To investigate the influence of forced injection hole on the temperature characteristics of bearing housing turbine-end field, the copper-constantan thermocouple was carried out on steady and transient temperature experiments of bearing housing on the engine workbench. The experimental results show that compared with the conventional bearing housing under the same experimental condition, the forced injection hole bearing housing has a good cooling effect in turbine-end floating bearing and piston ring. The cooling effect is remarkable in steady state operation condition, the maximum temperature of piston ring can be decreased by 82.3 ℃ and the drop is 40.7%, the maximum temperature of piston ring can be decreased by 118.5 ℃ and the reduction is 43.4%. In the transient operation condition, the maximum temperature of turbine-end floating bearing can be decreased by 36.9% and the drop is 11.6%, the maximum temperature of piston ring was decreased by 42.5 ℃ and the drop is 9.8%. After the engine is stopped thermally, the maximum temperature of floating bearing and piston ring are affected by heat reversing flow, the maximum temperature is far higher than the temperature in the rated power point.