poster standard sizes are 13cm×18cm, 19cm×25cm, 31cm×42cm, 42cm×57cm, 51cm×71cm, 61cm×91cm and 71cm×111cm. The common sizes of posters are 51cm×71cm and 57cm×84cm.

The name poster originated in Shanghai, which is a way of publicity. In the old days, posters were used for plays, movies and other performances and activities. People in Shanghai usually call professional drama performances "the sea", while those engaged in professional drama performances are called "going to the sea".

newspaper design is non-profit, which is the biggest function of poster design. Posters are different from commercial posters, and their starting point is not for commercial purposes and interests.