Given assumptions about the attributes of knowledge,the enterprise knowledge theory has re-explained the core propositions of the enterprise theory,such as the existence of the firm,internal coordination of the firm,boundaries of the firm,the allocation of decision-making authority in the firm and etc.

Based on the transaction costs theory and the knowledge-based theory of the firm, the paper tries to explain the formation mechanism of MNC strategic alliance from the angle of governance mode choosing.

After the characteristic of knowledge service system in this industry is analyzed, a viewpoint is presented that knowledge service system for this trade should be built up and perfected through knowledge task-division and knowledge collaboration.

This article refers to a large number of domestic and international research achievements,and then summarizes enterprise knowledge collaboration from three aspects of conception,technique and application.

Recently,the phenomena of knowledge collaboration(KC) emerge continuously and it has become the developing trend of knowledge management and enterprise collaboration.

The significance and classification of knowledge synergy are also described.

The process of knowledge synergy in knowledge chain s inter-firm cooperation is a process of knowledge flow.