Nine-type personality theory can not only analyze people's personality and behavior, but also predict people's personality and behavior. For example, if you know a person's personality, you will know what he is thinking and doing when he is happy, sad or angry. Of course, so is myself. Although type nine personality is so difficult to understand, it is actually very practical. It can help you understand yourself and others, and help you constantly improve yourself to a better state. Therefore, it is of great practical value to study the ninth personality.