Wang Xizhi and Wang Xianzhi, the father and son, pioneered the book style, swept away the clock and developed old ideas, becoming one of the few revolutionaries in China's book circle, which has been unparalleled for hundreds of years. Until the rise of Yan Zhenqing in the prosperous Tang Dynasty, calligraphy became popular, which changed the theme of simplicity and elegance since the two kings and entered the realm of boldness, boldness and richness. The integration of the ancient meaning into the new style, clumsy and clever, formed the second revolution in the history of book circles after the two kings. Yan Zhenqing's Xi Tie and Wang Xizhi's Preface to the Orchid Pavilion are also called "two treasures", which shows Yan Shu's position in the eyes of future generations.