Poly(2-hydroxy-3-(methacryloyloxy) propane-1-sulfonate) (PHMPS), a polyhydroxyl sulfonate, was used as both the template and the dopant in the in situ doping chemical oxidative polymerization of pyrrole. The resultant PHMPS doped polypyrrole (PPy/PHMPS) nanoparticles were characterized with FTIR, UV-vis, TGA, zeta potentials and TEM techniques. It was found that their size decreased and their dispersing stabilities in water increased with the increasing of the feeding ratio of PHMPS. The PPy/PHMPS nanoparticles possess high electrical conductivity at room temperature and the weak temperature dependence of the conductivity. The conductivity-temperature heating curves are discussed. (C) 2010 Elsevier Ltd. All rights reserved.