The brothers Dou Meng and Dou Ji are the representatives of the continuation of the northern Xianbei cultural tradition in the middle Tang Dynasty. Shu Shu Fu Zhu completed by them is one of the most outstanding works of the calligraphy study of the Tang Dynasty. In the Tang Dynasty, when literati and calligraphers of ethnic Han came out in succession, calligraphy practice and calligraphy theory were highly prosperous, such a masterpiece of calligraphy with rich rhetoric, profound theory, and innovative style came from the descendants of Xianbei, and is a product of the fusion of Hu and Han culture. It is also the combination of Dou's calligraphy tradition and the culture of the times. The text structure of Shu Shu Fu Zhu is composed of four parts: Shu Shu Fu, Annotation, Zi Ge and Ti Shu Shu Fu Hou. It is in the traditional calligraphy works since the Eastern Han Dynasty. A new style of Fu Zhu Ge was produced, which resulted in innovation in the achievements of calligraphy study. To be more specific, the combination of Fu and annotation created one of the largest masterpiecesof Zhou and Qin calligraphers' biography history in the Han and Tang Dynasties; the introduction of historical annotations into Fu annotations created the first historical annotated masterpiece of calligraphy; the emergence of Zi Ge created the first book theory with the significance of the construction of the traditional calligraphy study concept system. The emergence of Shu Shu Fu Zhu is to follow and carry forward the Chinese cultural and academic traditions between the Han and Tang Dynasties. It is an important achievement of the national integration and cultural development since the Wei and Jin Dynasties in the Tang Dynasty and in the field of calligraphy study.