Objective To compare the mechanical properties of the ribbon arch with the rectangular wires. Methods Using 3-point bending tests to investigate the load-deflection characteristics of 8 groups orthodontic wires which belonged to 3 brands, each brand inclued 0.016×0.022 inch, 0.017×0.025 inch, 0.018×0.025 inch, and 0.019×0.025 inch rectangular wires. Result(1)The bending strength of the ribbon arch was significantly larger than the orthodontic rectangular wires in all brand.(2)No matter which brand,the bending strength of 0.017×0.025 inch ribbon arch was larger than 0.019×0.025 inch rectangular wires. There was a statistically significant difference between the Plasdent and Ormco groups(P<0.05). Conclusion(1)The stiffness of ribbon arch was bigger than rectangular wires, which helpsmaintain the stability of the occlusal plane.(2)We can use 0.017×0.025 inch ribbon bow wire as the main bow wire of the orthotic.