Objective To observe the effect of the expanding training orthosis on webbed-finger adhesion post burn. Methods From May, 2014 to April, 2016, 37 hands of 33 patients with webbed-finger adhesion post burn were divided into two groups. 21 hands from 18 patients were as experimental group, 16 hands from 15 patients were as control group. The control group accepted routine care, while the experimental group accepted the expanding training orthosis in addition. Their angles between the fingers were measured six months after treatment. Results The angles between the fingers increased in the experimental group after treatment (t>3.060, P<0.01), and were more than those of the control group (t>2.273, P<0.05). Conclusion Application of expanding training orthosis can improve the compliance of the patients with webbed-finger adhesion post burn, and promote hand function recovery.