Abstract: tBiological network is a kind of typical complex network, thus the methods for identifying of the key nodes in biological networks are mainly from general complex network methods. This paper introduces several methods for the key indicators in the general complex networks, and then sums up the methods for the identification of key nodes in biological networks. It points out the differences between the biological network key nodes recognition and other general complex networks. The research directions is also discussed.

Key words: graph theory, complex network, centrality index, biological network, key node