A1 A2 A3 diplomatic and official visa A1 is issued to senior officials of foreign governments, including ambassadors, ministers, diplomatic officials or consular officials, and their families. A2 is issued to junior foreign government officials or employees and their families. A3 is issued to foreign government officials (holding A1, A2) and their families.

B1 B2 business, sightseeing or visiting relatives visa B1 is a short-term business visitor and B2 is a short-term tourist and visiting relatives. Holders of these two certificates are absolutely not allowed to work in the United States.

C1 C2 C3 transit passenger visa C1 is issued to passengers who plan to transit the United States to other countries. That is, this kind of passenger only passes through the United States and has no intention of staying. C2 is issued to those who transit to the United Nations Headquarters. C3 is issued to foreign government officials and their families, or private employees for transit to the United States.

D is issued to the crew of international airlines flying to the United States or the crew of shipping companies. In principle, holders of such visas, You are not allowed to engage in business, sightseeing or visiting relatives in the United States. Such visas are usually applied by airlines or shipping companies recognized by the United States government on behalf of their employees.

E1 E2 Treaty Businessmen and Treaty Investors Visa E1 is issued to "Treaty Businessmen", that is, the employees sent by foreign companies to their branches or offices in the United States. E2 is issued to "Treaty Investors", that is, the so-called business investment visa. Refers to the trade treaty between the U.S. government and foreign governments, so the country of applicants for E1 and E2 must have a trade treaty with the United States.

F1 F2 visas for international students and their spouses and young children F1 are issued to foreign students. F2 visas for spouses and young children of foreign students.

G1 G2 G3 G4 G5 visas for employees of international organizations and their families G visas, It is issued to officials or employees of certain international organizations, and representatives appointed by foreign governments to these organizations and their families or private employees are also included in this category. Such international organizations approved by the US government include the United Nations Headquarters. The United Nations Educational, Scientific and Cultural Organization, the World Health Organization, the International Labour Organization, the International Monetary Fund, the World Meteorological Organization, the International Atomic Energy Association, the International Civil Aviation Organization and more than 3 other organizations.

H1 H2 H3 short-term staff visa is a visa that allows them to engage in short-term work in the United States. H1 is issued to short-term workers with special skills. Such as artists, technicians, entertainers, scholars, chefs, etc. H2 is issued to workers who go to the United States to engage in seasonal labor. Although the application does not need to have excellent ability, the employer must obtain a certificate from the Labor Bureau to prove that American citizens cannot be invited to take up such jobs. It will not endanger the work and salary of American workers. H3 will be issued to interns who go to the United States to receive skills training.

K1 K2 will be issued to the fiance or wife of an American citizen and their children. K2 will be issued to the underage children who have obtained the K1 visa (proof of their relationship with the beneficiary of the K1 visa is required when applying). .

L1 L2 visas for employees of multinational corporations and their families are issued to employees of foreign multinational corporations stationed in the United States. When applying, the company should make a request, and the spouse and children of those who obtain L1 visas can obtain L2 visas at the same time.