NOVELTY - Acid base blend electrolyte membrane manufacturing involves preparing polyethersulfone polymer for producing acidic polymer electrolyte membranes. Sulfone groups represented by chemical formula (I) are partially introduced in the acidic membrane. Polyaryletherbenzimidazole polymer is prepared for manufacturing basic polymer electrolyte membranes. Sulfone groups represented by chemical formula (II) are partially introduced in the basic membrane. 70-99.99 wt.% of polyarylethersulfone polymer is mixed with 0.001-30 wt.% of polyaryletherbenzimidazole polymer.    USE - Method for manufacturing acid base blend electrolyte membrane.    ADVANTAGE - The acid base blend electrolyte membrane manufacturing method enables production of membranes with high ion conductivity and extremely low methanol permeability.    DETAILED DESCRIPTION - The mixture produced in the acid base blend electrolyte membrane manufacturing is dissolved in an organic solvent and resulting mixture is casted and dried on a glass or Teflon (RTM: a fluoropolymer) plate. The sulfone group introduced in acidic membrane has chemical formula (I).    A=-S-, -SO-, -CO-, - P(C6H5)O- or -SO2-;    B=-CO-, -C(CH3)2-, -C(CF3)2-, -C(CF3)(C6H5)-, -PO(C6H5)- or -SO2-;    a divide by (a+b)=0.1-0.6; and    c=2(a+b)+d.    The sulfone group introduced in basic membrane has chemical formula (II).    Y and Y'=-S-, -SO-, -CO-, -P (C6H5)O- and -SO2-;    X=-O-, -C(CH3)2-, -C(CF3)2- or -SO2-;    n / (n+m)=0.1-0.6;    k=2(n+m) +l, if the terminal group of polymer is 0.    INDEPENDENT CLAIMS are included for:    (1) a manufacturing method of polyarylethersulfone polymer, which involves direct polymerization of bis phenolic group monomer and manufacturing sulfone group by direct polymerization of bis phenolic group monomer;    (2) and a direct methanol fuel cell, which uses the acid base blend electrolyte membrane.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of ionic conduction measurement apparatus for an acid base blend electrolyte membrane.    Teflon block (1)    Fixing screw (2)    Ventilation opening (3)    Polymer film sample (4)    Electrode (5)