Abstract: With the changing of enterprises' living environment, such as the intensification of global competition, the increase of economic uncertainty and the rapid development of information technology, competition increasingly expands from competition of organizations to competition of supply chains. The level of information technology and information sharing are increasingly important in the supply chain. In addition, proper supply chain governance can significantly improve the overall performance of the supply chain. There are abundant research results on the interaction between supply chain governance mechanisms and supply chain performance. However, most of their samples come from supply chain companies in developed countries, and few researches combine supply chain governance mechanism, information technology level, information sharing and supply chain performance. Based on this, a theoretical model of the interaction between supply chain governance mechanisms and supply chain performance is constructed, and then the mediating effects of information sharing and the moderating effects of information technology level are analyzed, with an aim to test the existing research findings and further develop and enrich the research fields of the supply chain, so as to provide theoretical and practical guidance for Chinese core companies. Based on 380 questionnaires among middle and senior management personnel and technical staff from the supply chain related posts, the correlations between social control, formal control, information technology level, information sharing and supply chain performance are analyzed by using of structural equation model (SEM). The results show that:(1) Both social control and information sharing have significant and positive effects on supply chain performance. While, formal control has a significant and negative relationship with information sharing, and its effect on supply chain performance is not significant.Core companies in the supply chain should strive to establish good credit mechanism and cooperation atmosphere between supply chain node enterprises, so as to promote harmony exchanges and interactions among partners, and ultimately improve the overall competitiveness and performance of the whole supply chain. For example, Anzazebusch has established a special "Affordance Learning Center" to promote knowledge sharing among partners. (2)Information sharing has a partial mediating effect on the relationship between social control and supply chain performance, but the mediating effect of information sharing on the relationship between formal control and supply chain performance is not significant.(3) The moderating effects of the level of information technology are verified in the relationships between supply chain governance mechanisms and supply chain performance.Core companies should realize that information technology has an increasingly important role in strengthening supply chain partnerships and information sharing, which is also a main source of improving the overall performance of core companies and their supply chains. For example, Shenlong Automobile has adopted EDI technology in its international trade with Citroen to facilitate mutual exchange and contact, which greatly enhancing the supply chain's service level and market responsiveness.

Key words: governance mechanism, information technology level, information sharing, supply chain performance