Corrosion control for CO2 pipeline is especially important in the study of carbon capture, utilization and storage (CCUS) project. Based on the research results, corrosion rate, mechanism, and process of CO2 pipeline were summarized in this paper. The results showed that H2O was the key factor for corrosion, and the content in pipeline transport was under 0.038% (volume fraction). The corrosion rate was 4.0 mm/a when mixed with SO2 and O2 , and even 12 mm/a when mixed with NO2. Corrosion was accelerated when O2 concentration was low. When it was higher than 0.057% (volume fraction), passivation phenomenon appeared and the corrosion rate was below 0.01 mm/a. In CO2 corrosion products, there were three layers: equiaxed crystal FeCO3 in surface layer, clubbed crystal in middle layer and dense crystal particle FeCO3 in innermost layer. During the process of CO2 corrosion, steel pipeline dissolved to form Fe3C framework, and FeCO3 crystal particle deposited on its surface. Then, CO22? and HCO3? diffused inward to form the middle and innermost layer. In engineering design, corrosion-resistant tube, protective layer tube, corrosion inhibitor, and cathodic protection are used to solve corrosion problem.