Abstract: It is an effective way to reuse the refinery wastewater after advanced treatment to the circulating cooling water system in petroleum industry. However，corrosion and fouling are two unfavorable problems in practical application. In this paper，effects of flow velocity and temperature on corrosion and fouling in dynamic circulating cooling water system were investigated. Results showed that the change in flow velocity was only influential to the point corrosion in stainless steel test tube，the most serious point corrosion formed at flow velocity of 1.0 m/s，the weakest point corrosion was found at flow velocity of 0.5 m/s. While，the change in temperature was similarly only influential to the point corrosion in stainless steel test tube，the most serious point corrosion formed at the temperature of 30 ℃，the weakest point corrosion was found at the temperature of 20 ℃. Meanwhile，the fouling in stainless steel test tube showed a sharp increase when temperature increased. To control the fouling formation and to avoid the invalidation of scale inhibitors，the temperature in circulating cooling water system should be controlled no higher than 30 ℃.