Network of water army engaged in the topic of speculation, event marketing, public sentiment interfere with network groups, normal transmission, Therefore there is a need for in-depth discussion of their behavior and characteristics. Through the use of semantic-based information extraction technology functions and related algorithms, Including the hiring of water collected military and ordinary Internet users in Sina forum tech sector for some time published data; analyzed navy posting, posting and temporal characteristics of normal Internet users 24 hours a week online QQ number of three sets of data distribution; get sambong hour period on a typical distribution Draw water army groups with valid proof of full-time, Verify that the network of water army is an organized group with a mutual organization synergistic; Finally, accounts and comment a network of relationships, using the Fast algorithms on network structure , divided and statistics, obtained water army groups meet typical community structures conclusions.