Abstract: In this paper, we present an uneven clustering routing algorithm based on reputation model in CIoT considering both energy saving and reputation assessment. In the cluster establishment phase, we adopt an uneven clustering mechanism which controls the competitive scope of cluster head candidates to save the energy of CIoT. In the cluster heads election phase, the residual energy and reputation value are used as the indexes to select the optimal cluster head, where the reputation mechanism is introduced to support reputation assessment. Simulation results show that the proposed algorithm can balance network energy distribution and enhance network reliability.