In business contacts ， business correspondence is not only a medium for communication，but also establish/set up friendship means to attract business correspondence features and functionality of a business correspondence in the decision must pay attention to the principles of courtesy， the writing of the success of business has an extremely important Thus，in day-to-day business activities，we should be noted that in the Business English writing the application of the principle of courtesy in order to better co-operation to promote the smooth conduct of
