A dual-core photonic crystal fiber temperature sensor based on the surface-plasmon-resonance was proposed. The holey analyte channel in the center of the index-guiding dual-core photonic crystal fiber is coated with a titanium nitride layer and filled with a liquid mixture of ethanol and chloroform exhibiting a large thermo-optic coefficient. The shift of the resonance wavelength for the coupling between the guided-core mode and surface-plasmon-polariton reflects the variation of temperature or refractive index of the infiltrated liquid mixture. With the full-vector finite element method, the impacts of various factors on the transmission loss spectrum and its resonance wavelength were analyzed. The numerical calculation indicates that by any of the means of increasing the outer-cladding-hole diameter and decreasing the innermost-cladding-hole diameter or the hole pitch, the coupling efficiency, namely the resonance amplitude, can be increased. It is found that titanium nitride film shows superior surface-plasmon-resonance sensing characteristics over conventional gold film in the temperature range of －20℃~ 120℃, featuring an increase of both resonance wavelength shift and temperature sensitivity with an increase of film thickness and attaining the maximum temperature sensitivity of 6.22 nm/K.