Although multiple methods have been developed to detect or remove trace Pb2+ions,1-8 performing both roles together still remains a challenging task.In this study,we present a gating membrane with poly(N-isopropylacrylamide-co-acryloylamidobenzo-18-crown-6)(poly(NIPAM-co-AAB18C6))copolymer chains as functional gates,in which large amount of crown ether units are introduced as Pb2+receptors by a two-step method.