Abstract:

Knowledge network is a kind of interconnected network that is born in the process of diffusion and communication of knowledge by the actors who create,transfer,absorb and apply knowledge,such as enterprises,universities,organizations and institutions.This paper takes statistical data of the papers published in cooperation about the biotechnology both in the database of ISI (international) and VIP (Chinese) from 2000 to 2009 as data source.Based on the theory and methods of social network analysis,it uses UCINET and Pajek to analyze the spatial polarization and diffusion of knowledge network at international level and at provincial level. Generally,the network is still in the phase of expansion,the robustness of the network is gradually improving,and the network structure changes to mature.At the international level,the spatial polarization of network is evident.At the national level,the structure of network changes from hierarchical to flat,and accordingly the spatial structure of network changes from one pole to muticores and further to muticenters.Based on the spatial distribution of the network,the knowledge exchange area is divided into four types:knowledge accessagglomeration,knowledge gateway, bypass agglomeration and peripheral utilizer.Finally,provide some advice to the government for policy making to improve the technological innovation in China.