Talking about Hui: "The Southern Tang Dynasty (Li Yu) is good at writing and vigorous as cold pine and frost bamboo, which is called it." Xuanhe Painting Spectrum: "Later masters painted Jin Cuodao again, which was refreshing, distinguished and unique. After the master Jin Cuo used the method of three strokes, he became a painting in his later years, so he trembled like calligraphy. " According to the Book of Dharma, Jin Cuodao's book is also complete. Li Yu's paintings and calligraphy no longer exist, but later generations have quite copied them. "freehand brushwork" and "oriental element book" contain: "Sun Shangzi is good at trembling, which can be seen in clothes, hands and feet, leaves and streams." In the Tang Dynasty, Zhang Yanyuan's Fa Shu contained a book as a whole. The specific form and style can no longer be investigated.