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Delay tolerant network, because of the unreliability of the link, and the limit of the network resources, needs to select the appropriate data forwarding algorithm to ensure efficient message forwarding and delivery. According to DTN properties, this article first establishes the DTN two-layered mobility model. Then it introduces node's location, direction of movement and other important parameters to give a new DTN data forwarding algorithm by combining with the moving speed. The algorithm can calculate the node transmission capacity more exactly. Finally the simulation experiment conducts for the algorithm. Simulation results show that the algorithm, to a certain extent, improves the success rate of message delivery and transfer efficiency and reduces the transmission delay.