Han Yanzhi, the word temperature. Suide (now Suide, Shaanxi) people. The year of birth and death is unknown, living in12nd century. Born in Jiangmen, he is the son of Han Shizhong and Liang Hongyu, a national hero and anti-gold star, and the eldest son of Han Shizhong. Influenced by his family, Han Yanzhi, a teenager, had a strong idea of being loyal to the monarch and serving the country. In the eighteenth year of Shaoxing, he was admitted as a scholar, and later held various official positions in Beijing and local areas. In the second year, Dadao became a Langguan of the Housing Department, always leading the Huaidong army horse money and food, and achieved remarkable results; For seven years, he was stationed in Ezhou, taking charge of all the armies and strictly training the army. In the early days of Xichun's rule, he was appointed as the special envoy for gold. In the fifth year of Xichun, he compiled the Annals of Yongjia Citrus in Wenzhou, which is the first monograph on citrus in the world. In his later years, Han Yanzhi devoted himself to studying, collected historical events since the Song Dynasty, and wrote a book, Shui Xin Mirror, with a volume of 167. After his death, the emperor named him the Duke of Qichun.