Piezoelectric technology which converts mechanical energy to electrical energy has received attention for an alternative of power supply in low powered electronics. Poly(vinylidene fluoride)(PVDF), organic piezoelectric material, shows good piezoelectric performance, flexibility and chemical stability, However, it is strong hydrophobic, which is not good matched with common metal electrode. Conductive organic material is a good candidate to solve this problem. PEDOT:PSS, one of the best conducting polymer, is hydrophilic and acidic not good matching with PVDF. In this study, two types of PEDOT derivatives were synthesized by oxidative polymerization. The polymers had rod-like structure, and hydrophobic. The surface matching with PVDF was very good, and the piezoelectric performance were enhanced more than the one of reference with PEDOT:PSS-CNT composite.