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In order to solve the conflict between the shortage of ship navigation radar system’s storage space and large raw echoes data and files, a mixed compression algorithm of the bitmap compression -half a byte compression - Double Huffman compression is presented, according to the character of ship navigation radar’s data .On the base of half a byte compression algorithm, this algorithm combines the bitmap compression and the Huffman compression algorithm. In theory, the compression ratio of pure half a byte compression algorithm can run up to 50%,the total compression ratio can reach more than 76% when being combined with the bitmap compression and Huffman compression. It has been proved by the experiment that the new algorithm can save a large amount of storage resources for ship navigation system, and improve the rate of data transfer.