The advertisement of light box in the Riverside Scene at Qingming Festival shows that the time limit of urban trade has been broken. According to Sohu. At the end of the Tang Dynasty, with the appearance of the night market, light box advertisements appeared. The Riverside Scene at Qingming Festival reflects the urban life in the Northern Song Dynasty, in which the form of light box advertisements adapted to the night market, indicating that the night market had been normalized in the Northern Song Dynasty, which broke the time limit of urban trade. The Riverside Scene at Qingming Festival is a genre painting in the Northern Song Dynasty, and it is the only representative work of Zhang Zeduan, a painter in the Northern Song Dynasty. It is a national treasure cultural relic, depicting a bustling street and surrounding scenery in Bianjing City in the Northern Song Dynasty, and reflecting the prosperity of urban life and the life scenes of the people at that time.