The internal combustion engine used in the high-concentration gas power generation process, although its manufacturers are different, some of the structure will be different, but in general, its basic structure is the same, are composed of gas intake exhaust, ignition, cooling, lubrication, control several systems. The gas intake and exhaust system contains gas, filter, intake and exhaust valve, etc. After the gas and air are fused through the filter, they enter the combustion engine cylinder block, and the heat energy is converted into kinetic energy and the movement of the piston and connecting rod is promoted, and the power is output. The cooling system uses the cylinder liner and the cold water pump to circulate the coolant between the cooling water tank and the gas turbine to achieve the purpose of cooling. The ignition system uses the ignition transformer and spark plug to ignite the mixed gas. The lubrication system uses the oil pump to lubricate the lubricating oil. The control system uses the metering valve and throttle valve to reasonably adjust the amount of gas entering, so that the proportion of gas in the mixed gas is about 7% and the gas is burned in the gas cylinder block.