The polycrystalline perovskite-phase PT/PZT/PT ferroelectric thin film was prepared by sol-gel method. The domain and domain wall structures were investigated by scanning force microscopy. The out-of-plane polarization(OPP), in-plane polarization(IPP), the OPP amplitude and OPP phase images were obtained. The domain of the film has a complex structure with c-domain and deviated-c-domain the direction of which deviated from the surface normal of the film. The complex domain structure is related to the orientation of the crystal grains in the film. For the［111］oriented films, the 180° domain wall is formed when deviated-c-domains have reverse directions in OPP and IPP. The 90° domain wall is formed when the domains have the same direction in OPP and reverse directions in IPP, or when they have reverse directions in OPP and same direction in IPP.