Aiming at the requirements of the maritime English correspondence, the language characteristics of the maritime English correspondence are analyzed in this article, and the factors influencing the written skills of the maritime English correspondence are discussed, and the principles of “7C” including the courtesy, the consideration, the completeness, the conciseness, the clarity, the concreteness, and the correctness should be utilized in the written of the maritime English correspondence, and the contents are listed in one complete maritime English correspondence, with their functions, that could help to enhance maritime staffs’ written capacity.