After Song Shenzong proclaimed himself emperor, he also thought that Tongzhi was not only helpful to understand the ups and downs of dynasties, but also the history recorded in the book was like a mirror, which could be used for reference. Therefore, he changed his name to Tongzhi Sword. "Zizhi" means help, "Tong" means from ancient times to the present, "Jian" means mirror, warning and lesson. Later, people referred to Zi Tongzhi Jian as Tong Jian for short. This book was compiled in the second year of Song Yingzong Zhiping (AD 1065) to the seventh year of Zongshen Yuanfeng (AD 1084), which lasted 19 years. In order to write this book, Sima Guang paid a lot of labor, and the first draft alone piled up two rooms. Although Sima Guang was born in a bureaucratic landlord family, he served as Kaifeng official, Bing general, Longtuge straight bachelor, imperial academy bachelor, imperial academy official and Shangshu assistant minister. He is very conservative and stubborn in politics, but he is extremely rigorous and responsible in the process of compiling "Learning from the Same Resources". Get up early for work every day and don't go to bed until late at night. Afraid of oversleeping, he specially made a well-rolled log pillow. He woke up as soon as he rolled over. He called this pillow "police pillow".

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