Alkali aluminum chloride and polyferric sulfate coagulation which effect better coagulation effect of the main reasons for the water temperature, water PH value, suspended solids and other water. Water temperature has a significant effect on the coagulation effect. The surface water temperature in winter in Xinjiang is very low, and sometimes the water temperature is about 0 degrees Celsius. Although it is difficult to obtain a good coagulation effect even after adding a large amount of coagulant, the coagulation generally forms slowly and the coagulation particles are small and loose. Alkali chloride is more affected by the water temperature because aluminum salts are extremely slow to hydrolyze at low water temperatures and polyferric sulfate is relatively less affected. PH value of water on the coagulation effect of these two polymer coagulant are not obvious, basic aluminum chloride water treatment PH to adapt to the range of 4-8, polymeric ferric sulfate in the 4-11, overall In terms of polymeric ferric sulfate to adapt to a wider range of PH values. When the content of suspended solids in the raw water is low, that is, the turbidity of the raw water is low, the coagulation effect of the polymeric ferric sulfate is better; if the raw water turbidity is high, the coagulation effect of the basic aluminum chloride is better; Aluminum to adapt to higher water temperature, turbidity higher water quality. Polymeric ferric sulfate for water PH wide range of low temperature low turbidity water purification effect.