Wu Sanda's calligraphy skills are profound, and his calligraphy works are rough, bold and magnificent. Shi Xianzhang's pen is slow, fast and powerful, with Yan Liu's strict statutes and the strange gestures of two kings, which makes him magnificent. Both of them have high attainments in calligraphy and are known as the second masters in Chang 'an.
Wu Sanda: Director of China Calligraphers Association and Vice Chairman of Shaanxi Calligraphers Association. Shi Xianzhang: Member of China Calligraphers Association, librarian of Shaanxi Literature and History Research Institute, and vice president of Calligraphy and Painting Research Association.