to compare impact of kidney supplemented medicinals-Liuwei Dihuang and Bawei Dihuang on orchic function for old rats.Methods:Normal control group: eight 3-month SD adult rats (male); twenty-four 22-month old rats were randomly grouped to old age group, Liuwei treated group and Bawei treated group. Medicinals were intragastricly administrated for sixty consecutive days. Changes in sperm motility, generative cell apoptotic rate, and proliferation index were observed using semen auto-analysis (CASA) and flow cytometry technology.Results:The old group showed a significant decline than the adult group in sperm concentration (P<0.05), motile ratio, rectilinear movement ratio as well as apoptotic rate (P<0.01), and a rise of proliferation index (P<0.05). Both treated group are marked by elevated motile sperm ratio (P<0.01) and dropped apoptotic rates (respectively P<0.05, P<0.01). Bawei group was superior to Liuwei group in rise of rectilinear movement ratio and fall of apoptotic rate (P<0.05).Conclusion:Both medicinals were effective in raising sperm motility and reducing generative cell apoptotic rate for old rats in which aspects Bawei had advantage over Liuwei.