Born in Edo Castle (now Tokyo), Peninsula County, Musashi Province. His family was poor, so he taught himself Chinese at the age of 5, and later studied Confucianism, military science, etc. At the beginning, he believed in Zhu Xi's studies. After the age of 50, he was influenced by the ancient Chinese literary scholars Li Panlong (1514-1570) and Wang Shizhen (1526-1590). His thoughts changed greatly. He began to criticize Song studies and pioneered and promoted them in Japan. Ancient Chinese Dictionary. His theory had certain progressive significance at that time and was once popular in Japan. Later, it had a great influence on Japanese Chinese studies and Mito studies.