Abstract: Small and medium-sized agricultural enterprises exist their own disadvantages so that it is difficult for them to independently deal with competition in the market and strengthen themselves in the short time. Therefore, these enterprises don’t have their own advantages. Cooperation in agricultural market provides a perfectly new marketing ideas for small and medium-sized enterprises. How to choose the cooperative partners determines their success or failure of cooperation. From their own characteristics of the small and medium-sized agricultural enterprises, This article designed a set of the partner selection evaluation index which is suitable for them. And then, this article use multi-layer fuzzy synthetic judgment method dealing with Positive Analysis to help small and medium-sized agricultural enterprises choose their own marketing cooperative partners.