Ambassador: The full name is "Ambassador Extraordinary and Plenipotentiary", which is the highest-level diplomatic envoy. Dispatched by a head of state to another head of state, it enjoys higher courtesy than the other two diplomatic envoys (minister and agent), and has the right to request the head of state in the host country to meet and negotiate with senior officials in the host country. Its main duties are: to be responsible for the implementation of the functions of diplomatic representative offices and to handle the affairs of diplomatic representative offices with full authority in accordance with the instructions of their own governments. An ambassador to one country may concurrently serve as an envoy to another country or two or more countries, but he must obtain the consent of the receiving country, formally submit credentials to the head of state of the receiving country, and go to the receiving country regularly or irregularly to perform the duties of ambassador. Minister: The full name is "Minister Extraordinary and Plenipotentiary" or "Minister Plenipotentiary". 196 1 the Vienna convention on diplomatic relations stipulates that the minister is the second rank of diplomatic envoys, and is sent by the head of state. His courtesy is second only to that of the ambassador, but his substantive status, duties and diplomatic privileges and immunities are the same as those of the ambassador. Its appointment requires the prior consent of the receiving country. In addition, some countries have ambassadors in their embassies. Unlike the ambassadors extraordinary and plenipotentiary, such ambassadors are not the directors of embassies and are not sent by the heads of sending countries to the heads of receiving countries, but diplomats at the embassy level next to ambassadors, and their appointment does not require the prior consent of receiving countries.

Agency: The agency is the highest representative in the country when the director of the embassy is absent for some reason. The agent is usually the political counselor as the chief librarian. Counsellor: a title of diplomat. Its diplomatic status is second only to that of ambassador and minister. Counsellors in some countries are also divided into minister counsellors and counsellors, or first-class counsellors and second-class counsellors. The counselor's main task is to assist the director of the embassy in his work. When the director of the embassy is absent for some reason, the political counselor, as the chief librarian, usually acts as a temporary agent to preside over the library affairs. Some embassies have business counselor, Economic Counselor, Agriculture Counselor, Science and Technology Counselor, Education Counselor and Cultural Counselor in addition to the Political Counselor, who are sent by the relevant departments of the sending country to assist the director of the embassy in charge of relevant business. Secretary: Collect all kinds of business knowledge, for example, first of all, some basic laws, regulations and systems of the host country, such as regulations on the sale, construction, maintenance and fire control of houses, traffic regulations, banking regulations, tax system, health regulations, etc. Secondly, the conventions and regulations of diplomatic protocol, the regulations and customs of holidays, the working hours of government agencies, and even the special national customs and religious taboos of the host country, such as which behaviors will be considered taboo, which places must not be involved, and when gifts should be given; There are also various procedures for local government departments, airport customs procedures, and information such as addresses, telephones, people, procedures and the like in transportation, banking, communications, insurance, procurement, municipal administration, water and electricity, greening, medical care, meteorology and so on. Some things are done almost every day or every month, such as going to the post office, going to the bank, going to the customs, shopping, washing things, repairing equipment and so on. Military attache: maintain and develop military exchanges between the two countries, and at the same time contact the military and defense departments of the host country by all legal means to understand the military development of the host country and report the military trends and actions taken by the host country to the sending country. Due to the complexity of diplomatic relations, in the embassy, the military attache is also the military adviser to the director of the embassy, assisting the director in military exchanges and negotiations.