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In this paper, routing problem of Delay Tolerant Networks (DTN) was investigated and a new routing scheme was proposed based on the Epidemic routing. By combining the advantage of a variety of related routing algorithm, a Limited Multi-copy Optimal Path-Hybrid Routing (LMOP-HR） was put forward belonging to the flooding message copies strategy. An optimal tree mixed strategy based on priority was proposed for the message distribution. Further, this strategy adopted priority-based cache management mechanism. It was proved that the proposed scheme could guarantee the optimal message delivery rate and reduce node energy consumptions. Numerical results showed that system performance could be effectively improved based on the proposed algorithm.