Drinking water is too neccessary for everyone .It must be pure and healthy.Turbidity is one of the most important problems in water .It may cause damage for humanbeings . So it must be controlled. This search aims to determine the suitability of dosing AL2(SO4)3·18 H2O, ,FeSO4.7H2O with the intention of reducing turbidity levels to acceptable limits . In the present study , a series of jar test was conducted to evaluate the optimum pH, dosage and performance parameters for coagulants,.We studied the effect of AL2(SO4)3·18 H2O, ,FeSO4.7H2O dosage on reducing of turbidity, The influence of pH on turbidity reducing , and the effect of slow mixing time on turbidity . And turbidity reducing by AL2(SO4)3·18 H2O was removed 96 % of the total turbidity. And turbiditu reducing by FeSO4.7H2O was removed 98 % of the total turbidity.