Abstract: To study the fouling causes of atmospheric column in Tianjin petrochemical company, the composition of the scaling and the properties of materials at the top of atmospheric column were analyzed. Based on the analysis results, technical measures were suggested，such as changing amount of corrosion inhibitor and regulating solution of injection water, adopting the new process and scale dispersant, resulting in improved fouling situation of the atmospheric column. The circulation volume at the top of column meets the design value and no harmful effect is found in down-stream products.