Turbine and compressor wheels are installed on the same shaft, when the engine is operating normally, the exhaust gases discharged drive the turbine, so that the compressor wheel rotates at the same speed, the speed of the turbine depends on the pressure, temperature, quantity of exhaust gas, and then through the control device such as bypass valves, sprinklers, etc. adjustment, to achieve the required speed, while entering the supercharger hot air through the intercooler cooling and then into the engine, so that the density and temperature are increased, under the same displacement, the combustion is more complete, the engine power is significantly improved, It has obtained very good economic benefits.