The comprehensive performances of phosphonic acid functionalized poly(ether sulfone) (PES-PA) are improved by compositing with 1H-1,2,3-triazol-4-yl functionalized poly(ether sulfone) (PES-Tri). The PES-PA and PES-Tri are synthesized via the nucleophilic aromatic substitution (S(N)AR) polycondensation, respectively, of diethyl 2,5-dihydroxyphenylphosphonate and 4,4'-difuorodiphenylsulfone and of bisphenol A and 3,3'-diethynyl-4,4'-difluorodiphenylsulfone, and followed by hydrolysis or post-polymerization click reaction and deprotection reaction. In addition, two functionalized monomers, diethyl 2,5-dihydroxyphenylphosphonate and 3,3'diethynyl-4,4'-difluorodiphenylsulfone are synthesized. Best comprehensive performances are achieved in the composite membrane consisting of 80% PES-PA and 20% PES-Tri by molar ratio of the functional structure units. At 100 degrees C and 90% RH (relative humidity), the proton conductivity of the composite membrane is 12.8 mS cm(-1), about 1.8 times improvement compared with pristine PES-PA. In addition, the hydrophilicity and methanol permeability are alleviated, the water uptake is reduced from 31.3% to 16.1% at 100 degrees C and 90% RH and methanol permeability is reduced from 19.0 x 10(-8) cm(2) s(-1) to 0.79 x 10(-8) cm(2) s(-1) at 30 degrees C. Copyright (c) 2016, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.