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A new strengthened and integrated mini-vehicle engine, XTD469Q electronic controlled and four-valve technology gasoline engine, was studied and developed. The structural features and the advanced technologies of the engine were discussed. The bench test of the reliability of the XTD469Q sample engine has been finished. As a result, the reliability and lifetime of the engine has been improved with the R & D technology of overall strengthened and integrated structure, as well as the developed technologies such as cooling system, lubrication system and timing drive system. Furthermore, optimized the intake and exhaust system, combustion system and TWC technology of XTD469Q engine improved the emission performance.