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Community related applications such as instant messengers or file-sharing tools enjoy a great popularity in the Internet. But, the forming of communities is unprompted and the joining of users is based on their interesting. The opportunity to spread malicious-programs or purloin user's information is provided to malicious users. So, a clustering algorithm based on trust is presented to form a safe and reliable community. First, the node trust value is computed by their past behaviors. And then, based the trust value computed, the clustering algorithm is promoted to form community. Finally, the simulation result has shown the credibility and safety of the communities in network applications.