Zhao Mausoleum is the tomb of Emperor Taizong of Tang Dynasty, which located in Mt. Jiuzong at Liquan County, northwest of Xi'an city. The calligraphy carving on epitaph inscriptions of Zhao Mausoleum has been known as the model of calligraphy skills in the early years of Tang Dynasty, and also shed light on exhibition and development of the calligraphy style in Tang Dynasty. The epitaph inscriptions of Zhao Mausoleum were made by famous calligraphers such as Ouyang Xun (歐陽詢), Chu Suiliang (褚遂良), Yin Zhongrong (殷仲容), Wang Zhijing (王知敬), Gao Zhengchen (高正臣), Zhao Mo (趙模), Zhuge Sizhen (諸葛思楨), Yu Lizheng(于立政), Wang Xingman (王行滿), Li xuanzhi (李玄植), Jiang Xi (姜晞), Bai Xizhi (白羲晊), Chang Zheng (暢整), Dou Huaizhe(竇懷哲), and even the successor of Emperor Taizong, Emperor Gaozong, Li Zhi (李治). The most frequent writing style of epitaph inscriptions is regular script (楷書), and followed by clerical script (隸書). Additionally, inscriptions of the epitaph on sarcophagus are mainly applied in seal character (篆書). "Zhao Mausoleum has plenty of excellent epitaph inscriptions, all the author and calligrapher are the best choice" the Qing Dynasty academician Ye Changchi (葉昌熾) said. Drawing from epitaph inscriptions of Zhao Mausoleum is a proper way to learn and to study Tang calligraphy.