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With the rapid development of Internet and the expanding application fields of network applications, it is not enough to maintain the network security only depend on those professional network technical administrators. In this paper a novel visualization tool based on treemap, which is called NetVis, is introduced to bind the network security technique and general network management together in an integrated visualization. NetVis is designed in 2D view. The experiments show that NetVis can not only detect the abnormal activities in the network, but also make the network management more intuitive and efficient.