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Abstract Objective: To study the effects of Salvia Miltiorrhiza Bge (SMB) on myocardial fibrosis in hypertension in rats. Methods: Normal Wistar kyoto rats served as negative control (group A). The rats with hypertension were divided into 2 groups: the hypertension group (group B) which served as the positive control and the SMB-treated hypertension group (group C). The effects of SMB on the systolic pressure, the myocardial content of aldosterone (ALD) and nitric oxide (NO) and the activity of superoxide dismutase (SOD) in the myocardium were detected. Results: The systolic pressure of the rats of group C showed no marked change after the administration of SMB and showed no difference from that of the rats of group B. The content of collagen Ⅰ and Ⅲ of the left ventricle, the collagen Ⅰ/collagen Ⅲ ratio and the content.of ALD were lower in group C than in group B and higher in group C than in group A. The content of NO and the activity of SOD in the myocardium were higher in group C than in group B and lower in group C than in group A. Conclusion: It was concluded that SMB was able to prevent or reverse the progress of myocardial fibrosis resulting from hypertension. The mechanism of this effect of SMB might be due to the fact that SMB can decrease the collagen synthesis and ALD content and increase collagen decomposition, NO content and SOD activity in the myocardium.