The main characteristic of borderline personality disorder is instability. The patient’s interpersonal relationships and emotions show instability in many aspects. They show obvious instability in cognition, emotion, and behavior. They are often emotionally depressed, anxious, In anger, interpersonal relationships often change dramatically between extreme intimacy and extreme opposition, and it is difficult to maintain stable interpersonal relationships. Some will have unclear self-concepts, confusion of self-identity, and even some alcoholism and vagueness of sexual orientation. They are often in fear of being abandoned by real and imagination, very sensitive to possible abandonment, and sometimes emotional The ability to withstand changes is relatively poor, often in a more diffuse state of anxiety. The main treatment method is psychotherapy, and it can also be combined with new anti-suppressive drugs.