"Qimen Dunjia" is a classic work of the Chinese nation, and it is also the first secret technique in the three secret treasures of Qimen, Liuren and Taiyi, and is the most rational method of the first of the three styles, known as the highest level of prediction of the Book of Changes, known as the study of emperors, and its essence is a higher astrophysics, revealing the role of the nine planets of the solar system and the earth's magnetic field. Qimen refers to the eight gates, and Dunjia is the first Tiangan, which is hidden in the Qimen Bureau.

The meaning of "Qimen Dunjia" is composed of three concepts: "Qi", "Gate" and "Dunjia". "Qi" is B (day), C (month), Ding (star) three odd; The "door" is rest, life, injury, Du, Jing, shock, death, and opening the eight doors; "Escape" is hidden, "Jia" refers to Liujia, that is, Jiazi, Jiaxu, Jiashen, Jiawu, Jiachen, Jiayin, "Jia" is the most noble in the ten stems, it is hidden but not revealed, hidden under the six instruments. The "six instruments" are E, Ji, Geng, Xin, Non, and Dec. The principle of seclusion is that Jiazi is the same as Liuwu, Jiaxu is the same as Liuji, Jiashen is the same as Liugeng, Jiawu is the same as Liuxin, Jiachen is the same as Liuren, and Jiayin is the same as Liuqi. In addition, it also cooperates with Peng, Ren, Chong, Fu, Ying, Rui, Zhu, Xin, and Poultry Nine Stars. The occupancy of Qimen Dun is mainly divided into three plates: heaven, door and earth, symbolizing three talents. The nine palaces of the heavenly disk have nine stars, and the eight palaces of the middle plate (the second palace of the middle palace) are covered with eight doors; The eight houses of the site represent the eight directions, standing still; At the same time, on the heavenly disk and earth, each house is assigned a specific Qi (B, C, D) Yi (E, Ji, G, Xin, Ren, and Gui Liuyi). In this way, according to the specific time, with the six instruments, three odds, eight gates, nine stars and a special pattern of Qimen Dunjia, in order to occupy the human society and the natural world, in terms of personnel relations, the selection of auspicious time and auspicious side, constitutes a unique category in Chinese mystical culture---- Qimen Dunjia.