Mathematical modeling how is the format of the memorandum of beauty match like this: title; The name (title, address) of the recipient; Address; Subject; Body; Conclusion (total closure); Signature (signature). The word "reason" was seldom used before. It can be placed befoRe or after address forms, or before re or Docket and Subject. If this item is written before the address table, it should be written from the capital letter on the left; If it is placed after the address, it is usually written in the middle of the letter. It mostly uses incomplete sentences, only a few words or even one word, in order to make the recipient understand the main content of the text at a glance and facilitate timely processing.