Abstract: A novel distributed method based on peer level model is presented to inhibit DDoS attack. The level model collects four factors including the behaviors of the current peer and its network status to evaluate level value by uncertain inference. Forwarding rate is decided by level value. The data on each peer are sorted by linear classifier and then discarded according to level value. Simulation experiment indicates this method could inhibit DDoS attack and enhance resilience of P2P overlay network.