There is a clear record of "Aconitum Gate" in Yuan Gui, an ancient book in the Song Dynasty. It is recorded that the main gate valve reads one foot and two feet, and the two columns are separated by one foot. The ends of the columns are Anhua bamboo slips, and the ink number is Aconitum.
At the same time, in Li Jie's Architectural Style in the Song Dynasty, there are detailed regulations and introductions on how to build the "Aconitum Gate". There are three names written in the book: one is Aconitum Gate, the other is table opening, and the third is valve reading. Today it is called the gate. Aconitum gate is eight to two feet high, wide and high. If it is more than one foot and five feet high, the width will only be reduced by one fifth. String together with double waist, and each door will be longer than the upper waist. The center will be divided into two points. The waist will be an ann, and the water version will be installed below the waist ... the doorposts will be eight points, each door will be eight inches long, and columns will be added. The Sun Moon Edition is four inches long, one inch wide and two minutes thick.
From these records, we can clearly see that Aconitum Gate in Song Dynasty was a combination of Huabiao and Fangmen. Because of the luxury and majesty of the "Aconitum Gate", it was used by a large family with status, power and money at that time to build the government gate.