Study implies that: the systemic expected profit with coordinated replenishment is improved,but not all the numbers profit in the alliance.

Service level constrained(s,c,S)inventory model with continuous re-view policy for coordinated replenishment is established.

Now, the united-buys are more popular and maturity in big enterprise than in SME.

This paper to start with improving SMEs competition, try to introduce the new management method "united-buys" and apply it.

From the angle of the sellers,this paper analyzes the phenomena of the shortage of the funds for book-purchasing,probes into the problems existing in the joint purchasing and bid purchasing,and puts forward some solving measures.

After analyzing the forming of joint purchasing in the industry enterprise alliance and the necessity of allocating the cost fairly and reasonably among each enterprise, the cost allocation model of the industry joint purchasing is built, based on the n-person cooperation game theory.

Based on the research of business strategic alliance and joint purchasing at home and abroad, this paper elaborates the union resource plans contents and its characteristics of this kind of new business administration, introduces the URP nucleus parts of interactive management, and still analyze the driving forces factor that the business sets up a union to steer joint purchasing.

In order to investigate the intention for two manufacturers with different demands to participate in joint procurement,this paper determines their EOQs and the corresponding costs under different procurement and inventory policies,together with the condition of their intention to apply joint procurement when a coordination cost exists.