Abstract: Currently, there is a plight that 野household contract responsibility system冶make land fragmentation and the Reform bonus disappear. The problem of agriculture, rural and farmers is still grim. In the background of this situation, the organizational form of family farms was proposed in the government documents so that agricultural management scale could be achieved. What scale of agriculture management is appropriate? However, it is impossible that government artificially designs family farms suitable size. This paper considers the farm size depends on the situation of farmers爷social network because they can take the market as the platform in which they can obtain material, information and other resources through their social network status.