At present, a copper plate laid by Liu Jiagongfu in Jinan in the Northern Song Dynasty is displayed in the Museum of Chinese History, and the image of the white rabbit on it and the slogan "Buy the first-class steel bars and make fine needles" have been established as the earliest trademark advertising objects known in China and even the world, which has high historical value. Although the name of Li Fang White Rabbit Trademark Agency is taken from the earliest advertisement in China.