This paper studies the photodegradation of dichlorvos pesticide residues in vegetables by ultraviolet excimer and direct sunlight. It was observed that the degradation of pesticide residues in vegetables conforms to the dynamic equation for pesticide degradation. The decomposition rate of the same concentration of organophosphorus pesticide was found to vary in different vegetables. This is attributed mainly to the pigments because chlorophyll pigments in different vegetables can stimulate the dichlorvos photodegradation. Through the uv excimer, the residual pesticide in the vegetable can be effectively removed in a short period of time, while the appears to be no adverse affects from this process. Therefore, it is possible to achieve a selective degradation of residual pesticides in vegetables through the use of uv excimers.