The signature of oil painting works is related to the commodity of oil painting. At first, the painter used signature as a symbol of propaganda. In order to expand his influence and increase the order of his works, he signed his name on his works. Over time, signing has become a painter's convention.

According to historical records, the oil painter's signature can be found in the works of Leahy Diu Lei in arles. Diu Lei combined his initials A and D together and signed his name on the screen.

Oil painters have various forms of signature, but they usually sign in the corner. Some painters sign their names on "props" or patterns, so that they can blend in with the picture. For example, holbein's signature in The Portrait of Amebach is written on a "re" in the background tree. Delacroix's Guide to People's Freedom was signed on a piece of wood tilted in the distance. Xie Luofu's signature of "Maiden and Peach Blossom" is near the tablecloth at the lower right.

Pinyin abbreviations commonly used by China oil painters. Modern painters often sign directly or with a combination of pinyin and name, and at the same time sign the year of creation, and sign the name of the work on the back of the picture. The exhibited works should indicate the size, material, year of creation, author and work unit, and detailed mailing address. Some painters often set special marks in the picture or corner to avoid imitation. Signing a picture is a way that painters often use. For example, the painter Mr. Hu Yichuan signed "Chuan", which is concise and easy to distinguish.