Su Huang Camouflage, namely "Song Sijia"-Su Shi, Huang Tingjian, Mi Fei and Cai Jing, these four people are considered to be the calligraphers who can best represent the achievements of calligraphy in the Song Dynasty.

Some scholars believe that Cai should be Cai Xiang, a calligrapher in the early Northern Song Dynasty. However, as far as seniority is concerned, if Cai is Cai Xiang, Cai should be ahead of Su. "Su, Huang and Mi" are all arranged according to the age. As a person at the end of the Northern Song Dynasty, Cai Jing was a Cai, so there should be no dispute.

Jin Yunchang, an associate researcher in the Painting and Calligraphy Department of Beijing Palace Museum, also emphasized this statement in the documentary "Elegant North Song Sijia in Momo" of Taipei Palace Museum.