Thermoelectric technology is used to convert heat energy to electric energy and vice versa, which is an interesting technology to recover electric energy from waste heat. In this study, we focused on a ternary hybrid system consisting of carbon nanotubes, polymers, and Ag nano- plates. The Seebeck coefficient hardly changed even when poly (N-vinyl-2-pyrrolidone)(PVP)-protected Ag nanoplates were used. On the other hand, the conductivity was improved by adding the Ag nanoplates. The power factor of the hybrid film in the presence of PVP-Ag nanoplates was 1.2 times higher than that without Ag. Further improvement was achieved by changing the protective agent for the Ag nano- plates from insulating PVP to conductive poly (3,4-ethylenedioxythiophene): poly(styrenesulfonate)(PEDOT:PSS). Based on these results, it was found that the thermoelectric properties were improved by adding the protected Ag nanoplates, especially those protected with PE- DOT:PSS.