With the constant improvement of the national environmental protection department's requirements on the management and emission of fuel vehicles,natural gas vehicles and new energy trams have become the development trend of the automobile industry.Natural gas vehicles have the advantages of low emission, greenhouse restraining and non-reliance on oil.Large domestic agricultural machinery engine has high power with the problem of high energy consumption and high emissions.In response to the environmental requirement, based on typical diesel engine of agricultural machinery as the research object, the key indicators of the dual fuel renovation are analyzed, such as the gas supply methods, gas sources selection, technical scheme and economy. The feasibility of the project is demonstrated as well to provide the technology reference for renovation of agricultural machinery dual-fuel project in the future.