Zhang Huaiguan, the date of birth and death is unknown. China was a famous calligrapher from Hailing (now Taizhou, Jiangsu) in the Tang Dynasty.
Zhang Huaiguan, a calligrapher and calligrapher in Tang Dynasty, spent most of his life studying calligraphy with a strong sense of responsibility. Zhang Huaiguan's calligraphy criticism works include Shu Duan, Zheng Yao Shi Lun, Book Review, Shu Lun, Forbidden Classics in Yutang, Ten Techniques of Using Calligraphy, Calligraphy Strategy, Liu Shu Lun and Zi Lun. He also wrote "Broken Painting", but it has been lost for a long time. Zhang Yanyuan's Famous Paintings of Past Dynasties in Tang Dynasty quoted some essays.