关键词: 聚类系数，环，网络图

Abstract: Triangles arc absent in bipartite networks, this paper proposed clustering coefficient definition in bipartite networks which is the fraction of quadrilaterals. Numerical results show that both coefficients have the same property.Furthermore this paper applied both coefficients to compute the number of large cycles,deduced an common expression for estimating number of large size cycles.

Key words: Clustering coefficient, Cycles, Network graph