China's 30-year reform and opening is a success in developing socialism with Chinese characteristics. Since reform and opening, changes in China's economic structure, its economic formation of society, market openness and mode of economic development are what can be regarded as successful exploration of developing socialism with Chinese characteristics, which is best embodied in the basic economic system of keeping public ownership as the mainstay of the economy and allowing diverse forms of ownership to develop side by side in the primary stage of socialism. Developing economic system of socialism with Chinese characteristics entails strengthening corporate system, market mechanism and macro control.