1. The levels from high to low are: China's first-level advertising enterprises, China's second-level advertising enterprises, China's third-level advertising enterprises, provincial-level advertising enterprises, provincial-level advertising enterprises, Provincial-level advertising enterprises, municipal-level advertising enterprises, municipal-level advertising enterprises, and municipal-level advertising enterprises.

2. The selection criteria include: registered capital, operating years, tax payment, turnover, business premises, personnel quality, professional equipment, award-winning works, social contribution, law-abiding operations, etc.

3. Evaluation agencies: The national level is evaluated by the China Advertising Association, the provincial level is evaluated by the Provincial Advertising Association, and the municipal level is evaluated by the Municipal Advertising Association.

Advertising companies refer to enterprises that specialize in advertising operations, commonly known as "advertising agencies." Comprehensive service advertising companies generally have at least four departments below the general manager or president, each of which is headed by several deputy general managers. At the same time, each department has a director, who can be appointed by another person or a deputy general manager. Advertising agency, also known as advertising agency or middleman. Its main business is to act as a bridge between advertisers, advertising agencies and advertising media.

1. Advertising production agency (Office) is a special form of advertising company that mainly provides services for various advertising products. Specifically including: art, decoration, photography, printing, light boxes, road signs, neon lights, specialty products and other production departments. They do not provide full advertising services.

2. In order to save money, advertisers are more proactive in advertising activities and set up their own advertising companies within the company. Companies can buy time and space directly from media outlets and receive commissions. At the same time, it can also provide various advertising services for enterprises.

3. In many advertising industries, advertising companies rarely register product trademarks. Many advertising companies believe that as an advertising industry, it is okay to do novel, creative and unique advertising designs, and to provide good advertising production quality and after-sales service. However, what is not well known is that some advertising agencies ignore these aspects and it is not enough to do these things well. Advertising companies, like other companies, must build their own brands and build their own brands. Only in this way can we gain recognition from customers, provide good advertising services, achieve better future development of the advertising industry, and gain the right to protect advertising products at home and abroad. As far as advertising companies are concerned, their trademark registrations can receive more attention and protection.