The feasibility of photocatalytic degradation ofthree different structures's organophosphorussuicides using TiO2 powders as a photocatalystwas studied. The results show that differentstructpos of organophosphorus pesticides had different photodegradation efficiencies, and fourorganophosphorus pesticides of 1. 0 ×10-4 mol/Lwere completely photocatalytically degraded intonewt phosphste after 40 min illuminationwith a medium pressure mercury lamp of 375 W.Some intermediate products of photocatalyticdegradation...