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 “U”shaped curve relationship.The market Competition has improved the restraint of CSR by the degree of ownership balance.