The six-yao line is just a tool, a method for the evolution of the hexagrams. To understand the six-yao line, you must first understand the eight trigrams. The six lines are divided into upper hexagrams and lower hexagrams. The upper hexagrams are lines 1, 2, and 3, and the lower hexagrams are lines 4, 5, and 6. The upper hexagrams are all yang, which are the stems in the eight trigrams, and the lower hexagrams are all yin, which are kun. The remaining six hexagrams are all evolved through the upper and lower hangings. The first line is the lowest line among the six lines, that is, the first line. The six lines are viewed from the bottom up. The bottom line is the first line (the first line), above it is the second line, and so on. , the top is the sixth line (upper line). Six Yao is the method and means to evolve the changes in the world and all things. It is the basis. A Gua must be six Yao, and each hexagram name is 3 Yao. However, it does not mean that a Gua is composed of two Gua names. There are many changes in the combination of hexagrams. , the deeper the understanding, the more random the combination becomes.