The opportunity network communication is to use the communication opportunity created by the mobile node to gradually transmit messages. Because in the ocean the nodes are sparsely distributed, however, the efficiency is not high when it is used in the ocean. Thus it leads to the low possibility of encountering communication among ships, Meanwhile, due to the relatively low ship speed and the fixed channel, the efficiency of tradition opportunity network routing protocol is not high. This paper makes full use of the ship position information, sailing direction and the interpolation algorithm to predict the future location that nodes may arrive at, and improve the spray and wait protocol, through which to increase the probability and efficiency of the data passing to the aimed ship and raises the connection quality of ship opportunity network. Finally, compared with the currently popular opportunity network routing protocol by simulation experiment, it has achieve relatively good experimental results.