Abstract: The Party’s Third Plenary Session of the Eighteenth proposed "actively development the mixed ownership economy" and take it as the prime method for materializing the basic economic system.Among mineral resources industry,oil and natural gas industry has the typical characteristics of long industrial chain,high-demanding professional skills,a number of links involved with administrative control,and high proportion of state-owned capital.By comparative analysis with foreign oil corporations such as Exxon Mobil,the major three oil corporations of China have the problems of poor profitability,low management efficiency and innovation capability which needs to be improved.The essay intends to put forward the motivation of developing mixed ownership economy,with the analysis of the external environment.Combined with the interaction theory framework extended from economics,and the analysis of SINOPEC cases,the essay,taking the example of oil and natural gas enterprises,would also like to put forward that the industry should achieve the realization of interaction in the three aspects which are capital,industry and management,under the aim of the improvement of profits,convergence of industries and refinement of administration.In addition,the essay would,accordingly,come up with the whole blueprint and several suggestions of developing the mixed ownership economy.