Yi Xin Fang is the earliest extant classic of traditional Chinese medicine in Japan. It brings together the essence of nearly 200 long-lost China medical health preserving classics, which is the representative work of Chinese medicine. Medical heart prescription is a national treasure of Japan and a monument in the history of medical exchange between China and Japan.

The writer Danbo Kanglai (AD 9 12- AD 995) is the eighth grandson of Aleutian King who was naturalized in Japan after Emperor Ling of the Eastern Han Dynasty. His medical skill is exquisite, and he was given the surname of Danbo, a famous doctor and a left door. He stayed in Japan for two years (that is, the Northern Song Dynasty was peaceful and rejuvenating the country for seven years; In 984 AD, it was written into 30 volumes of Medicine Heart Prescription, which is the earliest medical work in Japan now, and later became the secret code of court medicine, laying an unshakable historical position for doctor Danbo. The book collected 204 kinds of medical classics in China, most of which were lost in China. It was a masterpiece of Japanese traditional Chinese medicine at that time, covering a wide range of medical fields, even including health care and indoor medicine, which led to it being regarded as a quasi-banned book in Chinese mainland for decades.

In Yi Xin Fang, the cursive script mixed with Chinese and Japanese and the bitter and incomprehensible expression of the old saying make the general readers cry, and some even think that Yi Xin Fang is purely a heavenly book.

Yi Xin Fang is an important masterpiece of oriental medicine.