Abstract: The purpose of this investigation was to study the effects of chemical coagulation to remove the pollutants from Kashan Textile Sewage (KTS). The Lime, ferricchloride and alum were tested by jar test analysis. The removal of COD and colour is intended as indicators parameter. The results shown that lime with 1500 mg L-1 dosage is more efficient for treatment of KTS. Thus, Lime is optimum coagulant for this sewage.