The function of business correspondence is to obtain information or convey information, the two is to deal with matters related to business communication, and the three is to communicate and communicate feelings.

The principles of 7C should be grasped in writing business letters, namely: complete, correctness, clearness (concreteness), concreteness (concreteness), courtesy (courtesy), and understanding (consideration).

The right words and punctuation should be correct, because the content of business correspondence mostly involves the rights, obligations and interests of the two parties in business communication. If mistakes are made, it is bound to cause unnecessary trouble.

It is clear that all words should express their true intentions very clearly and clearly, avoiding double meanings or ambiguity.

Use the simplest common words to tell each other directly.

It is concise: to express the true meaning in the least possible words without damaging the politeness.

Being clear and concise is often complementary to each other. To discard the cliches and conventions in correspondence and telegram can make communication easier and more convenient.

One thing or another will make the letter and telegram clear, easy to read and attractive.

Specifically, the contents should be specific and clear, especially the correspondence that requires the other person to answer or influence subsequent communication.

Courtesy and courtesy: the tone of a written expression should show a person's professional accomplishment, polite and decent.

The most important politeness is to reply to each other in a timely manner. The most touching politeness is never doubting or even calculating the honesty of the other person.

Differences of opinion are bound to occur in business dealings, but politeness and communication may resolve differences without affecting the good relationship between the two sides.

Understanding: for the sake of each other, this is also the principle that has been emphasized in the development of business correspondence: stand on the other side's position.

When drafting business correspondence, we should always look at the problem from the other side's point of view and express ourselves according to the way of thinking of the other side. Only in this way can we communicate with each other.

The types of business letters and telegrams include: letter of correspondence, inquiry letter, reply letter, request letter, notification letter, contact letter.

From the specific functions of the business letter, we can also divide it into: reply letter, order letter, letter of appointment, congratulatory letter, thank you letter, introduction letter, invitation letter, letter of contact, letter of apology, sympathy letter, letter of condolence, letter of promotion.