A method for preparation of particle crystal films constructed from monodisperse SiO_2 colloidal particles in diameter of 286 nm is reported.The films were prepared from an ethanol suspension by vertical deposition that relies on caplillary forces to assemble colloidal crystal particles on a vertical GaAs substrate.The 3-D ordered films were characterized by reflection spectra and scanning electric microscope(SEM).The effect of sintering on the photonic band gap of colloidal particle crystals was investigated.