Principle of making signboards: neither too big nor too small. According to the size of the door head, the font design scheme of the characters is designed. Generally, the size of advertising words is not less than one-third of the height of the door and not more than two-thirds of the signboard at the door. For example, for a door with a height of 1 m, the general advertising words should be between 33.3cm and 66.6cm, and the common design words are mainly 50 cm and 60 cm. There are many kinds of signs at the door. According to the different floors, Minolta signs are divided into aluminum-plastic board signs, color steel gusset signs, paint glass signs, ecological wood signs, three-dimensional gusset signs and other types. According to the luminous characters, it can be divided into stainless steel luminous signs, resin luminous signs, exposed luminous signs, plastic luminous signs and mini luminous signs.