The mental health law of the PRC, which have been implemented On May 1, 2013, protects the rights of people with mental disorders. But the legal responsibility for instigating mental disorders to do harmful behavior involved in a few. Through the interpretation of the relevant laws and regulations, and based on the existing definition of the legal responsibility for abetting the commission of crimes, the paper tried to clear the legal responsibility for instigating mental disorders to do harmful behavior, which protects the rights of people with mental disorders better and improves the construction of our country legal system.