Abstract: The wastewater from coal-water slurry gasification in Jinling Petrochemical Branch, sinopec was deeply treated on-site by sequencing batch reactor process (SBR) with bio-activated sludge. In the case of volumetric loading of COD and ammonia nitrogen is 1.5 times greater than the industrial wastewater treatment system, the treated effluent COD concentration is lower than 60 mg/L, and ammonia nitrogen concentration is lower than 15 mg/L, and the total nitrogen concentration is lower than 20 mg/L, the average conductivity declines to 1 397 μS/cm from 3102μS/cm (55% reduction) when COD of feed is 400?600 mg/L and NH4-nitrogen concentration is 200?260 mg/L. The average effluent conductivity is 989μS/cm when the wastewater mixed with life sewage at a ratio of 1:1 was treated. All the properties of the effluent water meet the refinery water-saving assessment indicators and the requirements for the water reuse.