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When Geely power(GP),a gasoline turbocharged direct injection(GTDI)engine is used as range extender(RE),the power requirement is very low,while its work scope is limited at some points,As high compression ratio and miller cycle technolo-gy can be used to improve engine efficiency to broaden the work scope of the engine.In this article,high compression ratio,miller cy-cle,optimization of the turbocharger and friction reduction technology are used to improve the engine efficiency.