Upgrading the qualification of construction enterprises refers to the process that construction enterprises acquire new qualifications or improve existing qualifications on the original basis. There are the following differences between them: 1. Qualification increase refers to adding a new major or scope to the original qualification, such as adding the qualification of municipal public works construction general contracting to the original qualification of construction general contracting. Qualification upgrade is to improve the qualification level on the basis of the original qualification. 2. For the qualification increase, relevant certification materials shall be submitted for the new major or scope, and the construction experience of relevant projects shall be submitted if applying for the general contracting qualification of municipal public works; Qualification upgrade needs to meet certain conditions (such as assets, personnel, experience, etc. ) and conduct corresponding examinations and audits to obtain higher-level qualifications. 3. The purpose of qualification addition and upgrade is different. Increasing qualifications is to meet new business needs and broaden the business scope of enterprises; Qualification upgrade is to improve the ability and competitiveness of enterprises and better meet the market demand.