Do I need a visa to go to Thailand once?

If your previous visa is a multiple-entry visa and it is still valid, you can go to Thailand again without applying for a new visa; If the visa is a one-way trip or has expired, you need to apply for a new visa.

Extended information

Precautions

If the visa expires, you must pay a fine for overstaying and be sent back to China. The fine is 5 baht per day, with the upper limit of 2, baht. You can pay the fine directly at the airport immigration office. If you refuse to pay the fine, you will be prosecuted by the Immigration Bureau and detained in the Immigration Detention Center before the court decides.

Since March 2, 216, the General Administration of Immigration of Thailand has increased the penalties for foreigners' overstaying. Those overstayers who surrender to the Immigration Bureau according to the regulations, and foreigners who have stayed in Thailand for more than 9 days are not allowed to enter the country within one year after leaving the country; Stay for more than one year, and it is forbidden to enter Thailand within three years; Having stayed in Thailand for more than 3 years, and being prohibited from entering Thailand within 5 years; Stay in Thailand for more than 5 years, and you are not allowed to enter Thailand within 1 years. If the overstaying time captured by the immigration bureau is less than one year, it is forbidden to enter Thailand within five years, and it is forbidden to enter Thailand within 1 years if it exceeds one year.

Reference: Baidu Encyclopedia-Thailand Visa

Reference: China Consular Service Network-Thailand-Entry and Residence.