Abstract: The theoretical model of relationship between supply chain information sharing and operational performance with the mediating role of relational capital(trust and commitment)in a supply chain is proposed and empirically tested using data collected from 141 manufacturing companies in Pearl River Delta. The results show that there are two indirect paths in the relationship between information sharing and operational performance,the first one is "information sharing-trust-operation performance",the other one is "information sharing-trust-relationship commitment-operation performance",which provide evidence that there is indirect positive impact of information sharing on operation performance with the mediating role of trust and commitment constructs in relational capital theory.

Key words: Supply Chain, information sharing, operational performance, relational capital, trust, commitment