Objective:To discuss operational methods and clinical effect of fascia flap of backward sural nerve nutrition vessel.Methods:Fascia flap of sural nerve nutrition vessel was designed and cut at posterior side of shank,soft tissue defects of intermediate-inferior shank and ankle were repaired backwardly with the flap,and blood supply and venous return of the flap were observed.Results:All flaps survived among total 35 applications without obvious swelling,livor or tension vesicle.All flaps,whose area differed from 5.0 cm×4.0 cm to 20.0 cm×8.0 cm,were observed being located 5.0～7.0 cm above lateral ankle during operation.Their color and luster,texture and elasticity maintain well during 12 to 24 months'follow-ups.Conclusions:Fascia flap of sural nerve nutrition vessel is the ideal flap for repairing soft tissue defects of intermediate-inferior shank and ankle,with advantages such as reliable blood supply,convenient operation,and larger range to cut.