Low foaming scouring agents(PPFW) for PET fiber were prepared by blending of sulfonic acidamine condensate of polyowethylene(10) nonylphenyl ether(PSAC), polyoxyethylene(4) octadecylbenzylammonium chloride(POAC) and Sedlan FF-200(FF-200). As the results of several tests, PSAC/POAC/FF-200/water (5g/10g/25g/60g) mixture(PPFW-5) showed good cleaning power, penetrating ability and stability to alkali, and gave less problem in water pollution. Scouring effect of PPFW-5 was investigated by the change of percentage of exhaustion before and after scouring at various dyeing temperatures. The percentage of exhaustion of the unscoured PET fabric was 4.0% at 7$0^{circ}C$, while that scoured with PPFW-5 was 1.0% at the same temperature, which proved PPFW-5 to be a good scouring agent. Furthermore, the foaming power of PPFW-5 measured by Ross and Miles method was 8mm foam height immediately after foaming, and that measured by Ross and Clark method was less than 300mm foam height at 3$0^{circ}C$, and 21mm at 8$0^{circ}C$ As a result, PPFW-5 proved a good low foaming scouring agent for PET fiber.