Objective:To observe the inhibitory effect of sodium tanshinoneⅡ A sulfonate(STS)on a-smooth muscle actin(a-SMA)in partial bladder outlet obstruction(PBOO)rats' bladder and to explore its possible mechanism.Method:Establishment of PBOO rats models were made by partial ligation of bladder neck.Twenty-four SD rats were randomly divided into PBOO group,STS group and Sham group on average.STS group was given intraperitoneal injection of STS(10mg/kg)for four weeks,and PBOO group and Sham group were given normal ...