<p>Temperature-sensitive copolymer is an important functional material, and its directional application in different fields is a hotspot in recent years. This work introduced temperature-sensitive polymers into membrane materials for separation and enrichment of metal ions, and the process was designed as follows: Firstly, the temperature-sensitive copolymers of P (N, N-diethylacrylamide-co-acrylamide) (P(DEA-co-AM)) was successfully synthesized with different monomer feed ratios by radical polymerization at 70&#xa0;°C. Secondly, series characterization methods were adopted to study the structure of samples, and following results were achieved. After integrating the characteristic peak areas of the ¹H NMR, reactive ratios of DEA and AM was obtained by Fineman-Ross method(F-R) and Kelen-Tudos method(K-T), respectively, and result also evidenced that as the feed molar ratio of DEA to AM was 8: 2, the average segment length ratio between AM and DEA in P (DEA-co-AM) were 1.073: 8.072, respectively. FT-IR and DSC characterization results shown that the synthesized polymer was copolymer and random copolymer, respectively, UV–visible spectrophotometer test result showed the copolymer exhibited a good thermosensitive. Finally, a smart imprinted membrane was prepared by this copolymer with PVDF and was used for selectively adsorbing ruthenium (III) from the complex environmental, and experiments results documented that the imprinted membrane displayed a good adsorption capacity, which provided a great development potential in separation and enrichment of ruthenium (III) fields.</p>