Legal analysis: Door advertisements belong to urban management. Advertising is advertising, telling the general public something. As far as its meaning is concerned, advertising can be divided into broad sense and narrow sense. Non-economic advertisements refer to advertisements that are not for profit, such as government announcements, notices and statements of political parties, religions, education, culture, municipalities and social organizations. Economic advertisement refers to an advertisement for profit, usually a commercial advertisement. It is a means to spread the information of goods or services to consumers or users in a paid way through advertising media in order to promote goods or provide services. Commercial advertisements are such economic advertisements.

Legal basis: Article 11 of the Regulations on the Administration of City Appearance and Environmental Sanitation, outdoor advertisements, placards, galleries, windows, etc. It should be located in a city with healthy content and beautiful appearance, and should be maintained, painted or removed regularly. The establishment of large-scale outdoor advertisements must obtain the consent of the administrative department of city appearance and environmental sanitation of the people's government of the city, and go through the examination and approval procedures in accordance with the relevant provisions.