The compound coagulant RP - 001 has been prepared with the wastewater of soluble glass mother liquor in the petroleum catalyst factory and some other elements to treat the wastewater synthetically. The characteristic and influential factors of RP - 001 have been tested and compared with the coagulating effect of polyaluminum chloride(PAC). Flocculation tests demonstrate that the RP - 001 is a satisfactory coagulant for wastewater treatment. It has a lot of characteristics, such as the good treatment effect, the wide pH apply range and treatment temperature, the fast coagulation rate, the great coagulation grain density and the fast settlement speed, etc. The ratio of removing suspended-matter has exceeded 97 percent.