The present invention relates to an elastic tongue-dorsum retraction devicefor treatingobstructive sleep apnea/hypopnea syndrome (OSAHS), clamping pliers,installation pliers, aline guide, and an implantation method. The elastic tongue-dorsum retractiondevice of thepresent invention includes a tongue dorsum connection mechanism, an elasticretractor and atooth-side fastener. The tongue dorsum connection mechanism is disposed at thetonguedorsum portion, the tooth-side fastener is fixed to teeth or the alveolar boneor outside themaxilla and mandible lips, one end of the elastic retractor is connected tothe tooth-sidefastener, and the other end of the elastic retractor is connected to thetongue dorsumconnection mechanism. In this way, an elastic retraction device using thetooth-side fasteneras a fulcrum is formed. By pulling up the sagging tongue root forward,stenosis andobstruction of the airway at the glossopharyngeal portion are prevented,thereby providing afunction of treating snoring and OSAHS. Since the elastic retractor exerts anelasticretraction force on the tongue dorsum portion, the movement of the tongue tipis not affectedwhen the tongue root is properly pulled up, so that a clear language functionand an adequateswallowing function can be maintained, and not only the airway at theglossopharyngealportion is enlarged, but also good comfort is provided. In addition, thepresent inventionfurther discloses clamping pliers, installation pliers and a line guide foruse together with theelastic tongue-dorsum retraction device, and an implantation method of theelastictongue-dorsum retraction device.