Ren Tieqiao (1773 ~? ), his main achievement is that he predicted the eight-character numerology with his own life practice, annotated the eight-character numerology book "Tian Tian Mu" with detailed examples, refuted the theory that the eight-character numerology focused on strange patterns and evil spirits at that time, and tried to analyze the eight-character numerology only with yin and yang and five elements, which was logical and rigorous, without the deception and deception of charlatans, and made the traditional numerology step into the right direction. This theory was respected and carried forward by the three great numerologists in the Republic of China, and played a great role in the development of modern numerology.
Xu, a numerologist in the Republic of China, said in the Preface to Zi Ping Zhen Jie: "Among the old books, the first two books, Tian Tian Mu and Zi Ping Zhen Jie, are the most complete and detailed, and there are thousands of words in later generations, which cannot be surpassed, such as rivers, the sun and the moon, and cannot be abandoned." He added: "Later, scholars studied the principle of numerology and got these two books, so as not to go astray."