According to Article 21 of the Measures for the Administration of Catering Service License, the following materials shall be provided when applying for the extension of the Catering Service License:

1. Application for the extension of the Catering Service License;

2. A copy of the original Catering Service License;

3. Explanations that the business premises, layout process, sanitary facilities and other contents of the original Catering Service License have changed or not;

4. Other materials specified by the food and drug supervision and administration departments of provinces, autonomous regions and municipalities directly under the Central Government.

according to article 19 of the measures for the administration of catering service license: if a catering service provider needs to renew the catering service license, it shall submit a written application for renewal to the original issuing department 31 days before the expiration of the validity period of the catering service license. If the application for extension is filed within the time limit, it shall be handled in accordance with the newly applied "Catering Service License".

Precautions for the renewal of the Catering Service Permit:

Small restaurants with an area of less than 1,151 square meters do not need to apply for fire protection and environmental assessment;

For restaurants with an area of more than 2,151 square meters, it is necessary to apply for environmental assessment at the environmental protection department first, and also to apply for fire assessment at the Fire Department of the Public Security Bureau. Only when both of them pass can they apply for a catering license.

3, food vendors engaged in catering services business activities, in accordance with the relevant provisions of the Food Safety Law;

4. The Catering Service License shall specify the name, address, legal representative (person in charge or owner), category, license number, issuing authority (with official seal), issuing date, validity period and remarks of the unit, and shall be valid for 3 years, and shall be handled free of charge.

The above contents refer to:

Baidu Encyclopedia-Measures for the Administration of Catering Service Licensing

china food and drug administration-Food Safety Law of the People's Republic of China.