目的：探讨白藓皮水煎剂的止血作用。方法：将实验用小鼠分为对照组和实验组，采用大、中、小剂量灌胃给药，分别测定给药前和给药后的凝血时间。结果：实验组较对照组凝血时间明显缩短。结论：经药理实验证明白藓皮水煎剂具有显著的促进血液凝固作用。 Objective: To investigate the hemostatic effect of the water decoction of Radix Angelicae Dahuri. Methods: The experimental mice were divided into control group and experimental group. The rats were administrated with large, medium and small doses by gavage. The coagulation time before and after the administration was measured. Results: The clotting time was significantly shorter in the experimental group than in the control group. Conclusion: The pharmacological experiments prove that the water decoction of Bletilla striata has a significant role in promoting blood coagulation.