The types of official documents are short of languages.

In February 1981, the Interim Measures for the handling of official documents by state administrative organs issued by the general office of the State Council divided the documents of state administrative organs into nine categories and fifteen categories, namely, orders, orders, directives, decisions, resolutions, directives, notices, notices, notices, notices, notifications, reports, requests, approvals and letters. These types of myopia can be classified into ascending text, parallel text and downlink text.

Ascending language The writing of the subordinate organ to the subordinate organ, such as the request and the report.

Plain language A document issued between a parallel organ or a subordinate organ, such as a notice or letter.

Descending text The issuing of documents by a higher authority to a subordinate organ, such as orders, orders, instructions, decisions, resolutions, directives, notices, notices, notices, notices, briefings, etc.

Yanhua group and its member enterprises use only five types of letters, such as request, report, notice, notification and letter.