The experiment took bath wastewater as research object and adopted aluminum, iron and organic macromolecule as coagulants to examine the removal rates of LAS from bathing wasterwater,Determinted the PAC as the furthest coagulation,and the influenced factors such as the dosage of coagulation,the pH value,the sedimentation time,the stirring speed and stirring time were discussed using a method of one factor experiment,the result showed that the best operating conditions is that the doesage of45mg/L for PAC, 6.0~8.0 pH, 15min sedimentation time, 150r/min for 3min and 50r/min for 10min, the removal rates of LAS is 45.75%.