The behavioral and psychological symptoms of dementia（ BPSD） is a common symptom of cognitive impairment throughout the disease， and change with the progression of the disease. The incidence of BPSD is high， and its symptoms are complex and changeable. However， the cognition of it is insufficient and there is no unified standard of diagnosis and treatment. Therefore， this article gathered the key points of the identification and evaluation of BPSD according to the development of diagnosis and treatment of BPSD and the current situation in China， and summarized the intervention strategies of BPSD. Correct identification and effective intervention of BPSD can delay the progression of dementia，improve the quality of life of patients， and reduce the burden of disease， which should be paid attention to in practice.