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According to the wireless sensor network composed of sensors with various different functions, a routing algorithm based on the energy threshold's Intra-Cluster and Inter-Cluster multi-hop transmission (CI-CIMH)is proposed. In this algorithm, according to node energy distribution's difference, the weighting factor is introduced as adjustment parameter for the cluster-head's election. In the process of election, some factors such as each node's energy consumption, its adjacent degree to base station and its number of elected cluster are considered synthetically. The cluster rotation mechanism based on the energy threshold is used to reduce the number of cluster's election effectively and to balance energy consumption. Intra-Cluster and Inter-Cluster multi-hop transmission algorithm is proposed. Simulation results showed: This algorithm can reduce cluster-head's energy consumption, balance the network load, and prolong the network's lifetime.