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commercial correspondences are major means of written communication between two parties in the international tread under the international environment. the success of writting correspondence does have a great influence on the business of the enterprise. while, the writting of correspondence has iis regular pattern. first, we need to know the constitution of commercial correspondences,thus we can have a good understanding of them. the second, when we are writting them we need to stick to principles like courtesy understanding completeness clear concise concrete correct. and in the meantime we need to master the use of tone. we need to know the characteristics of the commercial correspondences well and to use it in your writting flexibly, thereby, the commercial correspondences could better serve the aim of communication in the international tread.