Ligustrazine Hydrochloride, is a natural substance discovered in the plant Ligusticum chuanxiong Hort. It inhibits platelet aggregation, improves atherosclerosis situation, protects endothelium injury, and has antithrombotic effects.in vivo,ligustrazine hydrochloride at 10 and 20 mg/kg produced significant analgesic effects against mechanical stimuli,and ligustrazine hydrochloride at 80 mg/kg, also significantly alleviated cold hypersensitivity manifested by reduction in cold vocalization temperature.