Objectives:To study the effects of Kaixin powder on mt DNA expression and apoptosis related genes of SAMP8(senescence accelerated mouse/prone 8) of rapid aging dementia mice. Methods:Total 40 of SAMP8 mice were randomly divided into four groups:model group,high Kaixin powder group,low Kaixin powder group and idebenone group. There are 10 mice in each group. 10 SAMR1 mice were used as normal group. Mice behavior was tested through Morris water maze and step-down tests,mt DNA content in the hippocampus of mic...