Thermally stable new conducting polymer blends of polyaniline/polyethersulfone were prepared by solution blending method in which -methyl-2-pyrrolidone and -cresol were used as solvent for polyaniline doped with camphorsulfonic acid, respectively. These blends show no phase separation with low percolation threshold (similar to 2 wt% polyaniline) and well-developed polaron band. Scanning electron microscopy images of these blends exhibit uniform and smooth morphology. In these conducting blends electrical conductivity increased up to 0.7 S/cm.