商業信函有其自身的特點。下面是商務書信寫作中的幾點注意事項，小心不要在你自己的工作中出現這樣的錯誤喔！
1.切忌主客不分或模糊。例子: deciding to rescind the earlier estimate, our report was updated to include $40,000 for new equipment.應改為 deciding to rescind our earlier estimate, we have updated our report to include $40,000 for new equipment. (we決定呀, 不是report.)
2.句子不要零碎。例子: he decided not to audit the last ten contracts. because of our previous objections about compliance. 兩個句子應該連在一起：he decided not to audit the last ten contracts because of our previous objections about compliance.
3.結構對稱,令人容易理解。例子: the owner questioned the occupant's lease intentions and the fact that the contract had been altered with ink markings. 應改為: the owner questioned the occupant's lease intentions and ink alterations of the contract.
4.單複數不要搞亂，不然會好刺眼，看著不舒服。例如: an authorized person must show that they have security clearance. 應改為 authorized persons must show that they have security clearance.
5.動詞和主語要呼應。想想這兩個句子的分別: 1. this is one of the public-relations functions that is under-budgeted. 2. this is one of the public-relations functions, which are under-budgeted.
6.時態和語氣不要轉換太多。看商務英語已經是苦事，不要浪費人家的精力啊。
7.標點要準確。例如: he did not make repairs, however, he continued to monitor the equipment. 應改為: he did not make repairs; however, he continued to monitor the equipment.
8.選詞正確。像affect和effect，operative和operational等等就要弄清楚才好用啦。
9.拼字正確。有電腦拼字檢查功能後，就更加不能偷懶。
10.大小寫要注意。除非必要不要整個詞都大寫，除非要罵人。例如: must change to os immediately. 外國人就覺得不禮貌和喝令人一樣。要強調的話，用底線，斜字，粗體就可以了。