The work aims to reduce contact resistance and improve corrosion resistance of Ti alloy surfaces. After activation on the surface of TA2, TiO2 developed into TiN coating in in-situ reactions. Surface morphology and composition of the coating were analyzed with X-ray diffractometer (XRD), scanning electron microscope (SEM) and energy spectrum analysis (EDS); conductivity of the coating was evaluated based upon interfacial contact resistance (ICR) and DC surface resistance; corrosion resistance of the coating was tested simulated proton exchange membrane fuel cell (PEMFC) environment. The TA2 bipolar plate treated with TiN had dense surface and grew preferentially along (111) crystal face. Samples receiving 2 h in-situ reaction at 750 ℃ exhibited the minimum ICR and DC surface resistance as well as the optimal corrosion resistance. Provided with pressure of 120 N/cm2, the resistivity stabilized at 6.7 mΩ/cm2. The surface corrosion current was 0.816 μA/cm2 in the simulated PEMFC environment. SEM showed that the surface was complete, the coating interfaces were complete in H2 atmosphere, and much pitting corrosion occurred in air atmosphere after scanning of constant electric potential. TiN coating produced on the surface of TA2 in in-situ reaction is conductive to improving its corrosion resistance and conductivity.