Zhang Jizhi's "Buddhist Sutra", written in running script on paper. The length is 28 cm and the width is 867.9 cm. Starting from the Northern Song Dynasty, beginners of Zen Buddhism must read the "Three Sutras of the Buddha". The so-called "Three Sutras of the Buddha" refer to the "Sutra of Forty-two Chapters", "The Sutra of Buddhist Relics" and "Weishan Police Policy". This "Buddhist Sutra" was written when Zhang Jizhi was 70 years old, that is, in the third year of Baoyou (AD 1255), and is now in the collection of the Palace Museum in Beijing.