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Wireless Multimedia Sensor Network (WMSN), as a novel technology, has attracted more and more attention with its board applications nowadays. The paper discusses the major challenges in current WMSN and focusing on some protocols relatively better fitting in the requirement of WMSN. Then a novel routing protocol CBRP-L basing on Cluster-Based Real-time Routing Protocol (CBRP) is proposed in this paper, which cuts off the high delay connections and runs LEACH algorithm for these nodes to forming a new cluster. Theoretic analysis and simulations are provided to show that the proposed protocol can effectively solve the problem of congestion and energy consumption, caused by only one cluster head with too many neighbors.