Abstract: This article provides a comprehensive treatment of the effluvial gas of sour water feed tanks. Different from normal treatment such as adsorption, absorption or condensation, and based on the process characteristics of sour water stripper, this method decreases the volatile components content maximally by changing process flow and operating conditions. The main measures include: ① The operating pressure of sour water degassing drum is kept as low as possible (0.05-0.1 MPa); ② Sour water in degassing drum is heated to 55-60 ℃ using low temperature waste heat of purifying water from the stripping bottom to make the degassing drum operated in higher temperature. ③ The first, second and third stage condensate liquid in single stripping tower or the return liquid from ammonia stripping reflux drum in double stripping tower is sent to a recycle liquid surge drum, and then is pumped to the outlet pipe of sour water feed pump; ④The thickness of oil layers in sour water feed tanks increases to 600-900 mm to form oil seal, preventing H₂S or other effluvial compounds running out of the sour water feed tanks. After the above measures are taken, there would have no effluvial gas discharging from the sour water feed tanks in normal operating conditions. This method has several advantages, such as no need of additional adsorbent, absorbent or coolant, low investment and operation cost, simple operation and no secondary pollution.