Kung's calligraphy is also celebrated among scholars. He started out by studying the techniques of the Two Wangs (Wang Xizhi and his son Wang Xianzhi, of the Jin Dynasty), and later turned toward the Yan script developed by Yan Zhenqing of the Tang.
孔德成的書法也名聞士林，他從二王（王羲之、王獻之）入手，後轉顏體（顏真卿），字體飄逸俊秀，各界索字者極眾。