Aiming　at　the　problems　of　limited　computing　power　and　high　security　requirements　of　terminal　equipment,　which　affects　people＇s　good　experience　on　some　network　resources,　we　proposes　a　provably　secure　server-assisted　verification　threshold　proxy　re-signature　scheme.　Threshold　proxy　re-signature　can　effectively　disperse　the　power　of　the　agent,　and　solve　the　security　problem　that　the　agent＇s　rights　are　too　concentrated.　In　the　server-assisted　authentication　protocol,　the　verifier　transfers　the　complex　bilinear　pairing　operation　to　the　server　through　the　interaction,　reducing　the　computational　complexity　of　the　verifier.　Under　the　standard　model,　the　scheme　can　effectively　resist　collusion　attacks　and　adaptive　selection　of　message　attacks.　Performance　analysis　results　show　that　compared　with　Yang＇s　scheme,　the　signature　length　of　the　new　scheme　is　at　least　twice　shorter　and　the　verification　efficiency　is　increased　by　at　least　57%.