TiO_2thin film electrode grown in si tu for dye sensitized solar cells was prepared using the micro plasma oxidation method.The electrolyte was filtrated according to the photoelectric p roperties of the TiO_2thin film electrode.The effects of electrolyte on the surface morphology,phase composition and internal impedance are investigated by scan electron microscopy (SEM),X-ray diffraction (XRD) and electrochemical impedance spectroscopy (EIS).The interaction between d ye and the surface of TiO_2thin film is studied by X-ray photoelectron spectr oscopy (XPS) ans infrared absorption (I R).The results show that the TiO_2film electrode has higher photoelectric perf ormance using (NH₄)₂SO_4as electrolyte than that using other electrolytes.The open circuit voltage,shor t circuit current and photoelectric efficiency are 149μA/cm²,652mV an d 0.095%,respectively.The prepared TiO_2films consist of a large amount of ru tile and a small amount of anatase and titanium,and the content of TiO_2prepa red with (NH₄)₂SO_4is higher than that prepared with H₂SO₄.Also,th e membrane layer is thicker,about 7.5μm.The internal impedance of the TiO_2film is relatively small.The XPS of the TiO_2film after being sensitized by the dye cis-Ru(dcbpy)₂(NCS)_2presents the cis peak of the O＝C-O group,which indicates that the d ye can be adsorbed on the TiO_2film surface.The infrared spectrum has an abso rption peak at 1737nm induced by the vibration of carbonyl in ester bond.It can be in ferred that the link between dye and TiO_2surface is realized by the analogou s ester bond.