This paper mainly discusses the following points: first, ownership problem; two, the ownership of the means of production and social system; three, public ownership of the means of production is the essential characteristic of socialism; four, state ownership is the main form of socialist public ownership of the means of production reality type; five, establish the national system of ownership is the what we lost; six, refuting the " reconstruction of socialist individual ownership "; seven, adhere to the reform, perfection and development of socialist public ownership.