This paper extracted the class-level software network topology model,and then proposed using closeness to measure the strong ties and structural holes to depict weak ties in network. There must be strong ties around the nodes in height-value degree by the correlation between closeness and degree,but the nodes in low-value were not necessarily associated with strong ties. Weak ties were related to occupying structural holes of nodes in network by the correlation between betweenness and structural holes,there...