The composite of exfoliated graphite/nano-TiO2 (EG/TiO2) is prepared by using the in-situ inserting method, and its photocatalysis properties was studied by investigating the decomposition of the dichlorvos under different conditions. The results suggest that the composite has good photocatalysis properties for the decomposition of dichlorvos, and it can be reproduced after baking at 700 A degrees C.