As industrial clusters grow fast, they need to improve their competitiveness and to realize industrial upgrade, which can be reached by using social capitals and increasing organizational learning ability. This paper, based on cases, establishes a conceptual model of industrial cluster competitiveness influenced by social capital from three dimensions of social capital and organizational learning ability, and uses structural function model and Lisrel software to test the assumption. During effects of social capital and organizational learning ability, the three dimensions of social capital, structural, relation and recognition dimensions, promote the organizational learning ability directly and indirectly, and vice versa. This study offers a useful supplement to related theories.