To evaluate the efficacy,safety and acceptability of different drugs in the treatment of mixed states in bipolar disorder using the Cochrane systematic review method. The results showed that for the treatment of bipolar depression with mixed features,there is evidence to support the efficacy of lurasidone and quetiapine. Lurasidone has low metabolic and sedative side effects,and can be used in children and adolescents with bipolar depression with mixed features. Quetiapine has balanced anti-depressant and anti-manic effects,with low risk of phase transition. There is evidence to support the efficacy of olanzapine in the treatment of bipolar manic with mixed features. However,it is necessary to balance the efficacy and side effects of olanzapine,and pay attention to the risk of phase transition. For mixed episode in Bipolar disorder,aripiprazole had most research evidence. Aripiprazole has fewer side effects on metabolism and prolactin,and can be used in children with bipolar disorder. Valproate and lithium are recommended by experts for the treatment of mixed state in bipolar disorder. The inconsistency between current studies is still significant,and high-quality randomized controlled trials are urgently needed to provide more comprehensive evidence-based support for the treatment of mixed states in bipolar disorder.