中文摘要：

通过对中国教科网中．edu．cn域名下的网页进行搜索，建立了一个由366 422个网页和540 755条网页之间的超链接构成的复杂有向网络——中国教育网。经分析发现该网络的网页分别处于四个不同的层次上，各网页自组织连接构成一个复杂有向网络。大部分节点具有入连接边，只有少数节点具有出连接边，既有入连接边又有出连接边的节点就更少，节点度分布尾部呈幂律分布。该网络演化时，网页的增添通常仅在各高校子网中选择有关网页进行连接，不会在整个中国教育网中去择优连接。根据中国教育网的这些特点提出了该有向网络的演化模型，模型反映了中国教育网的一些主要特征。

英文摘要：

By searching the documents of the domain name . edu. cn in China Education and Research Network, this paper sets up a complex directed network constructed by 366 422 web pages with 540 755 URI.s. These documents are parts of four different levels, and they constitute a complex directed network by self-organization. Most of the vertices have incoming links, and a few vertices have outgoing links, those vertics which have both incoming and outgoing links are very few. The vertex distribution has a power-law tails. New adding pages always connect with those pages selected from its sub-network, and they do not connect with the pages selected from the whole network. According to these features, the evolvement model of this complex directed network has been proposed. This model reflects some main characteristics of the China Education Network.