The invention is a clustering method based on assistance in Ad Hoc network relating the field of Ad Hoc network and clustering management in the network. The Ad Hoc network is a wireless network without infrastructure and the clustering management is a more efficient network module. Reasonable selection of the clustering head is significant for the Ad Hoc network adopting clustering structure. The invention provides a method clustering method based on assistance. The method reduces probability of the cluster node that would become network bottle neck in existing clustering method by selecting a cluster-establishing way of assistant node in the cluster for the cluster head, reducing data information process of the cluster node and saving energy of the cluster head, which is beneficial to manage the network and to improve performance of the network.