Abstract: The distribution law of fracture in rock mass is the key to study rock permeability and engineering stability.Rock fractures of staggered distribution which exist in nature can be looked as a kind of network.Based on this view，the fracture networks are analyzed by using complex network theory with relevant parameters.The results showed that rock fracture networks owned low average shortest path-length and high clustering coefficient.In other words，rock fracture networks appear the properties of “small-world”.The results have an auxiliary effect on analyzing rock permeability and magma displacement law.

Key words: Rock fracture, Small-world network, Clustering coefficient, Average shortest path-length