【Objective】 To investigate the mechanism of behavior and memory change on hippocampus ultrastructure and gene expression of Calcium-CaM-dependent protein kinase Ⅱ(CaMK Ⅱ)in low-dose lead-uptake rats treated by QuQian Pill(QQP,Traditional Chinese Medicine). 【Methods】 Forty male Wistar rats were chosen and randomly divided into 4 groups:the control group(10 rats) was given distilled water orally,the model group(10 rats) was given 0.2% lead acetate orally,the low QQP dosage group(10 rats) based on the model gr...