Abstract: The preparation method of polysilicate ferric chloride (PSFC) flocculant with low grade hematite，hydrochloric acid and sodium silicate as raw materials and its flocculation performance were studied.The influences of various influential factors，such as temperature and concentration of hydrochloric acid，leaching time and liquid-to-solid ratio on ferric leaching rate were investigated.The ferric leaching rate can get up to 95.13%.At the same time，the study has probed into various influential factors that may have effect on PSFC flocculation performance，including the pH and time of silicic acid activating，Fe-to-Si amount-of-substance ratio and ageing time etc..The result indicated that PSFC has fine flocculation performance，and can dislodge the turbidity，colourity， suspended substance(SS) and COD↓Cr of dyehouse waste effectively.When the dosages are 100 mg/L，the dislodging rate of the turbidity，colourity，SS and COD↓Cr can reach 90.3%，85.5%，92.6% and 79.6% respectively.