In this study, attempting to obtain new electrically-conducting polymers, six conjugated copolyesters have been synthesized. First, bispyrazole and bisdihydroisoxazole heterocyclics monomers were obtained from close-closing of bischalcone derivatives by hydrazine and hydroxylammonium chloride, respectively. The Bispyrazole Heterocyclic monomer (BHZH) was used in the preparation of PHZT, PHZP, PHZO and dihydroisoxazole heterocyclic monomer (BHAH) was used in the preparation of PHAT, PHAP, PHAO. The structure of the monomers and the repeating units present in the copolyesters chain was confirmed by FT-IR, 1H-NMR spectroscopic techniques, Differential Scanning Calorimetry (DSC), X-Ray Diffraction (XRD) also the thermal properties of these copolyesters were evaluated by Thermo Gravimetric Analysis (TGA), the electrical conductivity results indicated the prepared copolyesters lie semiconductors region, in addition. The effect of increasing the TiO 2 nanoparticles concentration as a filler and the frequency on the electrical conductivity of the prepared copolyesterwas analyzed, the results showed the increase of electrical conductivity with increasing concentration of TiO 2 nanoparticles and the frequency.