Photo electrode is an important component of DSSC, so this paper did some research on it. Through the method of adding PEG additive into TiO2 paste, the electrical characteristics and efficienciesof DSSCs with photo electrode surface area were studied. In the case of not adding PEG in TiO2 paste,26 ㎛ thickness TiO2 photo electrode shows 5.081% efficiency. The highest short circuit current densitywas 10.476 mA/cm2. The structure of porous TiO2 film can be controlled through changing the PEGadditive amount in TiO2 paste and the molecular weight of PEG. When the additive amount of PEG20,000 in TiO2 paste reaches 5%, the peak efficiency with 26 ㎛ thickness TiO2 photo electrode was5.387% and its highest current density were 11.084 mA/cm2.