Abstract:This article takes companies listed from 2014 to 2016 as research objects, relies on principal-agent theory, stakeholder theories, and reputation theories, and examines the ownership structure, market competition, and corporate social responsibility(CSR) using a multiple regression approach based on a hybrid ownership perspective. At the same time, the relationship between market competition and equity structure was studied. Research shows that product competition degree and CSR are in an inverted “U†relationship; ownership concentration is positively related to CSR; equity balance and CSR are negative. When related to market competition variables, the mixed-owned companies listed degree of ownership concentration is still positively related to CSR,and the linear relationship of negative balance of ownership balance becomes an inverted “Uâ€shaped curve relationship.The market Competition has improved the restraint of CSR by the degree of ownership balance.