Objective:To investigate the analgesic mechanism of Shaoyao Gancao Decoction.Method:The Ⅰ and Ⅱ phase pain were observed with the pain model caused by formalin,and the variation of nitric monoxide(NO) concentration in serum and spinal cord of the pain model mice caused by ice acetate were determined.Result:Shaoyao Gancao Decoction had dose dependently inhibitory effect on Ⅰ and Ⅱ phase pain in formalin induced pain model animals.NO concentration in serum and spinal cord of ice acetate induced pain mo...