Knot is also called knot structure or shelf structure. Mr. Qi Gong once pointed out that to write a brush, it is necessary to grasp the structure of the pen holder and practice the characteristics of strokes. Frame structure is more important than stippling. Words with good spacing are not prominent in stroke characteristics and pleasing to the eye; Not the other way around. Therefore, it is very important to study and master the structural rules of words carefully. The so-called "beginner distribution, but seeking fairness".