As an electrode or electrode modified materials, films fabricated from commercially available poly (3,4-ethylenedioxythiophene) (PEDOT):poly (4-styrenesulfonate) (PSS) aqueous dispersions were widely used in modern organic optoelectronic devices. However, the film also suffers the low conductivity (≤0.8S/cm) and the acidity (pH=1.5～2.5), which are main limiting factors for the practical application. Therefore, the optimization of film properties has attracted a lot of attention. In this review, the new developments in the properties optimization of PEDOT: PSS films were summarized. More attention was paid to the improvement of PEDOT: PSS film properties by some especial treatment, such as organic doping, inorganic doping, thermal treatment, UV-ozone treatment, plasma treatment and high-electric-field treatment. Moreover, the mechanism of the performance optimization for PEDOT: PSS films were also mentioned. Finally, the confused problems and prospects of the research on the optimization of PEDOT: PSS film properties were commented.