Signature is a person's inner reaction at present, which can be a way of information transmission. One possibility for a person to change his signature frequently is that his thoughts and emotions fluctuate greatly these days, and he wants to express or vent his inner demands through his signature, so that others can see his current psychological state and meet his demand for attention to some extent. Another possibility is that he is sending a message to someone or a group of people and conveying his inner thoughts.