In the inheritance of calligraphy in the Yuan and Ming dynasties, Sisiju plays a very important role. As a Mongolian, his bold and bold character is enough to give new connotations and characteristics to calligraphy, which is one of the "traditional" arts in the Central Plains, making him a dazzling star in the history of China. He was a member of the scholars of the Borji family, and he also had "extensive" "friendships". Among the people who interacted with him, there were not only poets Ma Zuchang and Yang Zai, but also literary writers Xu Youren, Huang Shu, Hu Zhu and Gong Shitai. "History of the Yuan Dynasty" Volume 143 "Biography of Xisi": "Xixi, named Zishan, Kangli family. The father did not neglect the wood, and the ancestor Yanzhen". His great-grandfather, Hailan Bo, was originally a nobleman from Kangli who was attached to the Kelie tribe. He was defeated by the "King Khan" Tuo Lian Le, and his son Yan Zhen then became a "concubine" under the Mongolian Tolei throne. Since his grandfather Yan Zhen, he has been trusted by the Great Khan one after another, and has become the "rich family" of Bo'er Jiji. Xisi's father, Buhu Mu, served as an official in the Anzu and Chengzong dynasties. This official, who started his career as a student of the Imperial College, eventually became famous for his Confucianism-based and supportive governance. Xisi's mother, Wang, was Buhumu's second wife. She was a lady from a famous family with "Yi virtue". Xisi's maternal grandfather was Wang Shou, who served as Zhongshu Zuocheng, Yushi Zhongcheng, and Jixian University Scholar. Wang Shou's sister, Xixi's "grandmother", was praised by contemporaries for her "observance of festivals" just like her mother.