Objective: To study injury of liver and kidney among the workers exposed to terephthalic acid (TPA), ethylene glycol(EG) and (or) dowtherm A(DOW), and to research for the early biological monitoring indexes. Objective: To study injury of liver and kidney among the workers exposed to terephthalic acid (TPA), ethylene glycol (EG) and (or) dowtherm A (DOW), and to research for the early biological monitoring indexes.