The analysis of influencing factors on economic growth is an attractive scientific issue.Capital,labor power,technology or knowledge,principle and space have gradually become the analytic factors.These factors are causally related with economic output.The sectors in national economy construct the regional economic system.Each sector takes the other outputs as production factors,and supplies its own output for other sectors.The complicated demand-supply relationship integrated all sectors in national economy into an interdependent organization through the technical economy relation.Under the restriction of industrial network,various economic activities are accelerating the regional economic growth.If the sectors are regarded as nodes,and transaction activities as links,these factors could turn the demand-supply system into a complicated network.That is a new angle to research regional economic growth from industrial network.This paper maintains that both of the scale of input factors and industry are related to the structural characteristics of industrial networks,and emphasizes that it is necessary to bring these structural characteristics into the explanation framework of industrial output change.In order to do research on the essential features of industrial networks,we use the input-output tables of 42 industrial sectors in Beijing(2005) to set up a network based on industrial exchange link.And then,we discuss the efficiency of industrial networks in industrial development based on regression via moderator.It is found that: first,the specific connections in economy and technology between different industries make less industrial transaction links,and lead to the low cluster coefficient.Second,different industries have different numbers of supply-demand market.There are relatively few industrial sectors that have many supply and demand markets in Beijing's industrial network in 2005.Third,the structure parameters of the industrial network can be divided into two categories according to the influences on the industrial scale.One is the explanatory variable such as betweenness centrality.The other is the half moderator,which put emphasis on the causality between labor input,fixed assets investments and industrial scale.Meanwhile,the half moderators also have explanation function on industrial scale.