Abstract: In order to develop rubbish landfill gas internal combustion engines with high performance, the effect of CO₂ content in the landfill gas on the engine parameter is first analyzed. Then, on the basis of 2190T natural gas internal combustion engines, the 2190 landfill gas internal combustion engines are developed successfully by means of some important technical methods such as increasing compression ratio, precombustion chamber ignition, turbocharging. The test results show that the performance of the landfill gas internal combustion engines can be improved effectively by means of the above-mentioned technical methods.