In peer-to-peer (P2P) environments, trust is a very important issue when transactions/interactions occur between peers. In general, the trust evaluation on transactions/interactions relies on the recommendations from other peers, which may be inaccurate. This paper presents DynamicTrust, a P2P trust evaluation system. It is based on our peer trust evaluation model, which measures the credibility of peers’ recommendations, and thus filters noise in responses and obtains more accurate and objective trust values.