(1) Wei, Jin, Southern and Northern Dynasties period. Wei, Jin, Tang and Song dynasties.
(2) Features: ①Wei and Jin Dynasties: Chinese characters developed into a conscious art of calligraphy. ② During the Tang Dynasty: the art of calligraphy reached its peak, both cursive and regular scripts made great achievements, and the theory of calligraphy became increasingly mature. ③Song Dynasty: Calligraphy art has its own modalities, advocating the calligraphy style of Wei and Jin Dynasties, pursuing individuality while ignoring rules, and advocating intentional incompetence. Reasons: ① Wei and Jin Dynasties: Scholar groups gradually formed, and calligraphy became an ideal form for scholars to express themselves and pursue artistic conception, charm, and character; improvements in stationery such as pens, inks, and papers also provided conditions for the innovation of calligraphy techniques during this period. . ②Tang Dynasty: The country was unified, the economy developed, and the politics were clear and clear. The prosperous situation of feudal society emerged. When the dynasty was at its peak and the society was on track, laws and regulations became a universal social need. ③Song Dynasty: The Song Dynasty emphasized literature, the rise of the citizen class, and colorful social life.