Abstract: Based on the data of A-share listed company in the manufacturing industry in Shanghai and Shenzhen stock market between 2007 and 2015,the ordinary least square(OLS) regression method is used to empirically investigate the impact of customer relationships and differences of the nature of property rights on the supply of trade credit. The results show that:customer relations and trade credit supply appear relationship of inverted "U" shape; and compared with the state-owned enterprises, the customer relations of non-state enterprises and the "U" relationship of trade credit supply are more sensitive.