Objective: To assess the effect of Danshen 9403 (DS 9403), an effective fraction of Radix Salviae miltiorrhizae (RSM) on healing of bone fracture. Methods: Standardized radial fracture was performed in 120 Wistar rats. The model rats were randomized into four groups: Group A was fed with DS 9403, group B injected with Staphylococcus aureus , group C with normal saline administration, and group D with RSM injection. The treatment began at the first day of fracture. The rats were sacrificed on the day 25, 39 and 50 separately in batches and their intact radii were removed by dissection for detecting load and stress of three point bending test with autograph universal material testing machine (Shimazu, Japan). Results: The parameters of load in DS 9403 treated group on the 39th day and that of stress at 25th, 39th and 50th day were (6.20±1.32)N, (5.71±3.58)N/mm 2, (8.27±2.42)N/mm 2 and (66.25±26.21)N/mm 2 respectively, which were significantly higher than those in other groups, P <0.05. Conclusion: DS 9403 has the action of increasing the strength of fracture broken end. Method: Standardized radial fracture was performed in 120 Wistar rats. The model rats were randomized into four groups. : Group A was fed with DS 9403, group B was injected with Staphylococcus aureus, group C with normal saline administration, and group D with RSM injection. The treatment began at the first day of fracture. The rats were sacrificed on the day 25, 39 Results: The parameters of load in DS 9403 treated group on the 39th day. And that of stress at 25th, 39th and 50th day were (6.20±1.32)N, (5.71±3.58)N/mm 2, (8.27±2.42)N/mm 2 and (66.25±26.21)N/mm 2 respectively, Which were significantly higher than those in other gro Ups, P <0.05. Conclusion: DS 9403 has the action of increasing the strength of fracture broken end.