Four pillars and eight characters, that is, birth, is the date of a person's birth. Ancient Han astrologers calculated their fate and good or bad luck in the future. Find out the year, month, day and hour of the trunk calendar from the almanac, which adds up to eight words-this is what most people have, and there is almost no technical content. The technical content of four pillars and eight characters is mainly reflected in the arrangement of luck rhythm and its relationship with fleeting time; For example, how to grasp the annual rhythm, monthly rhythm (traditionally called Universiade), daily rhythm and time rhythm (traditionally called Universiade, but the traditional Universiade method was wrong and abandoned) are all related to the hardware of prediction level and accuracy. The traditional four-column, eight-character and long-term prediction model fails to grasp the proper luck rhythm, so it is difficult to have the functions of verifying the past, grasping today, predicting the future and verifying the due time of human biological rhythm. To learn four pillars and eight characters, we need to constantly absorb these new achievements and improve our forecasting skills and abilities.