My sister has anger problem.althogh she is happy most of the time.but when she is angry she can not control her temper.what is the best advise for her?

If your sister is 18: Or >, she's responsible for her own medical care, including mental health services. If her intermittent outbursts harmfully impact her functioning at home, work & school & with her peers, she'll benefit from evaluations & treatments, possibly medication management + mindfulness cognitive behavioral therapy, by a psychiatrist & psychologist. If she's < 18, your parents must decide to help her.