Two new conjugated poly-Schiff bases (PPpP and PPmP) were synthesized by polycondensation of p-phenylene diamine or m-phenylene diamine with 2,6-pyridine dicarboxaldehyde. PPpP and PPmP can form charge transfer complexes with iodine. Maximum conductivity of PPpP-iodine complex at room temperature is 10(-6) S/cm, which is 2 orders of magnitude higher than that of PPmP-iodine complex. Electronic spin resonance measurements discovered that there are stable radicals in both charge transfer complexes; and g value, line width, and spin concentration depend on doping degree. Magnetic susceptibility of charge transfer complexes of PPmP-iodine is composed of Curie magnetic susceptibility (chi(C)) and Pauli magnetic susceptibility (chi(P)). Its Curie constant (C), Curie spin concentration (N-C), and density of state at the Fermi level also depend on doping degree.