Legal analysis: the "three certificates" in the "three certificates in one" of business license refer to: business license, organization code certificate and tax registration certificate. According to the national regulations, enterprises must realize the integration of three certificates in the course of operation, that is to say, they must handle these three certificates.

Legal basis: Measures for the Administration of Registration of Individual Industrial and Commercial Households

Article 24 The business license of individual industrial and commercial households (hereinafter referred to as the business license) is divided into an original and a duplicate, which contain information such as the name of the individual industrial and commercial household, the name of the operator, the form of composition, the place of business, the business scope, the date and number of registration, the issuing authority and the issuing time, etc. The original and the duplicate have the same legal effect.

Article 25 The original business license shall be placed in a prominent position in the business premises of individual industrial and commercial households.

Twenty-sixth individual industrial and commercial households to change the registration involves matters specified in the business license, the registration authority shall issue a new business license.