中文摘要：

产业间循环是互联网时代区域经济的重要特征，也是形成产业竞争力的重要结构要素．在产业网络的基础上，研究了描述这一特征的产业圈度及其内涵．产业圈度是过一个产业的产业圈数量，描述了产业间的多向循环关联，体现产业在循环中的作用．圈度大的产业，在产业网络中可以影响更多的产业圈，是产业循环运转的枢纽．在研究产业圈度性质的基础上，设计了计算产业圈度的算法．计算实例表明，产业圈度能够从产业循环视角定量描述产业的重要性，更映区域经济产业关联结构的异同．这说明产业圈度作为一类结构性指标．对于深入研究产业集群、产业结构升级、产业竞争力等问题具有一定的理论和实际意义．

英文摘要：

Circulation among industries is an important feature of an economy and an essential structural factor to form its industry competitiveness in the interact age. Based on industry networks, we studied cycle degree of an industry and its connotation which describe this feature. Cycle degree of an industry is the nunlber of cycles crossing the industry, depicting multi-direction circular linkages and reflecting the effect of the industry on circulation. Industries with big cycle degrees can influence more industry cycles, and become the core of industrial cyclic operation. In view of the studies on the properties of circle degree of an industry, we designed an Mgorithm to calculate it. Exemplification indicates that cycle degree of an industry can describe its importance quantitatively from the perspective of industry circulation, and reflect the similarities and differences of industry structures. This suggests that as a kind of structural indicator, cycle degree of an industry is of great theoretical and practical significance for further researching on industrial cluster, the upgrading of the industrial structure, industrial competitiveness, etc.