Diesel generator demand rising at home and abroad,Whether import or export of product technique or requirements are increasingly high , while the production of domestic enterprises still focus on diesel generator install, lack of technology investment and R & D system management.Through the analysis of patent status of diesel generator of 7 domestic enterprises as Shanghai Kang Cheng, Shanghai Ketai, Shanghai Ruichang, Wuxi Baifa , Jiangxi Tellhow, Shenzhen SWT, insight technology advantages and development strategy into domestic enterprise, provide development ideas for other diesel generating sets’ domestic enterprises.