Anatase TiO 2 nanoparticles were prepared with th e peroxide -complex heat decomposit ion method.We investigated the photo -catalysis degradation of the agroch emicals using the anatase TiO 2 nanoparticles.Results show that th e agrochemicals such as cis -trans cypermethrin emulsion and poly -hyd razine germicides can be well degrad ed.But the pesticides with complex o rganic acid are difficult to degrade completely.The photo-cata lysis degradation of the agrochemic als using the nano-TiO 2 provides a novel method for preventi ng the environments from the agrochemical pollutions and eliminating the agro chemical remainders.