The format of correspondence between companies generally includes four parts:

1. Title: The title method of official documents is generally adopted.

2. Writing: The object refers to the addressee of the official letter, written on the left of the first line under the subject, with a colon at the top.

3. Text: The content of the official letter is the matter, which is the specific thing that the sender wants to tell the other party.

4. Signature: including the name of the sending unit, the signature of the principal responsible person and the date.

in writing letters, we should first pay attention to conciseness and clarity, and grasp the sense of proportion in terms. Whether it is a parallel organ or a non-affiliated essay, we should pay attention to the calm and polite tone, don't rely on the situation to oppress or force others, and don't have to flatter and be polite. As for the reply, we should pay attention to the pertinence of the writing and the clarity of the reply.

Secondly, the letter also has the problem of timeliness, especially the reply should be prompt and timely. Like other official documents, handle the letters in time to ensure the normal conduct of official activities.

The following points should be paid attention to in the writing of "letter" for extended materials:

(1) Write "letter" in strict accordance with the format of official documents.

(2) The contents of the letter must be specific and focused.

generally speaking, it is advisable for a letter to clarify a question or a thing.

(3) The contents of the letter must be true and accurate.

(4) The writing method of "letter" is mainly statements, as long as the work negotiated, questions asked and answered are clearly written to the relevant competent authorities for approval.

(5) The "letter" is sent with a request from the other party, either to discuss work, to ask questions, or to ask for approval. Therefore, the language of "letter" requires simplicity, sincere tone and humble attitude.

(6) At the end of the letter, idioms such as "Please reply immediately", "Hereby" and "This reply" are commonly used, but sometimes they are not used.

Reference: Baidu Encyclopedia: Letter.