The knowledge space of the network was constructed, which takes the techno-innovation process as a translation from a  to a  space and whose dimension is depicted by the innovative product as vertex of the space.  From the micro-and macro-viewpoint, the evolution of the knowledge base in the process was studied respectively.  On micro-level, the evolution was divided into the iterative sequence of the enterprise' knowledge base's border in the informationflow process, resulting in modeling the process by the fractal maths;  On macro-level, the correlation among the information output of the enterprises as the information sources and the entropy character of the knowledge base evolution and the information-flow cycle with the maximum entropy equation was discussed.