On the one hand，as the fundamental units of innovation activities in organizations，Ｒ＆ D teams play a key role in enhancing innovative capabilities and performance; on the other hand，there is a big challenge managers are facing in managing Ｒ＆D teams effectively in order to facilitate team innovation． By integrating the team’s psychological safety and learning behaviors，this study empirically examines how Ｒ＆D team’ s social capital influences the innovative performance by using a sample of 151 Ｒ＆D teams with 585 team members． The results indicate that ( 1) the three dimensions of Ｒ＆D team’s social capital ( i． e． ，structural，cognitive and relational capital) are positively related to the innovative performance，( 2) the team’s learning behavior partially mediates the relationship between the team’s psychological safety and the innovative performance，(3) the team’s psychological safety partially mediates the relationship between the team’s social capital and the team’s learning behavior，( 4) the relationships between the team’s structural，cognitive capital and the innovative performance are partially mediated by the team’s psychological safety and learning behavior respectively，while the relationship between the team’s relational capital and the innovative performance is fully mediated by the team’s psychological safety and learning behavior respectively．