Abstract: A PVC membrane chloride ion-selective electrode with functional polymers as active materials was prepared by thermocompression of its pellet. No plasticizer was added in membrane and no leaching of active materials was experienced. The electrode exhibits Nernstion response in the range from 1?10^-1M to 2?10^-4M for Cl- and is characterized by very fast response, longer service life, wider pH range in application and small internal resistance. The curves of electrode resistance against preconditional time was obtained. The conditioning of the electrode is related to the constant value of its internal resistance upon gradual decrease with increase of preconditional time.