Zhu (1 130 ~ 1200), nicknamed Lang Lang, is called Huian, later called Huiweng, also known as Mr. Ziyang, Mr. Kao Ting, the sick man of Cangzhou, and the old man of Yungu. Zhu Xi, known as Zhu Zi, is the most outstanding master of carrying forward Confucianism since Confucius and Mencius. Zhu is a student and a disciple of Cheng Hao and Cheng Yi. He was a scholar in Shaoxing for eighteen years, and lived in Ning Dynasty. He compiled four books, The Doctrine of the Mean, The Analects of Confucius and Mencius, as teaching books. He inherited the theories of Zhou Dunyi and Cheng Cheng in the Northern Song Dynasty and created the style of study of philosophy in the Song Dynasty, which was called Neo-Confucianism.