Under the condition of CO₂/H₂S coexistence, the possibility of pipeline corrosion increases sharply, so the selection of materials for gathering and transportation pipelines is very important. If the pipe material grade is lower, it will seriously affect the normal production of the pipe; if the pipe material grade is higher, it will cause a waste of economic costs. In order to make the selection of materials for gathering pipelines under the conditions of CO₂/H₂S coexistence more reasonable, a new method for selecting materials for gathering pipelines is proposed on the basis of the prediction model of CO₂/H₂S coexistence corrosion rate. The steps of the new method are: calculated the uniform corrosion rate of the material, the corrosion rate should meet the control value of the corrosion rate in the NACE standard (less than 0.076mm/a), and determined the material of the gathering pipeline under the CO₂/H₂S coexistence system based on the design life of the pipeline, remaining strength and economic evaluation. Taking the gathering and transportation pipeline of an oil field as an example, the material selected by the new method is consistent with the experimental results, which verifies the accuracy of the new method. The new method of material selection for gathering and transportation pipelines can effectively reduce the cost of pipe material selection on the premise of ensuring the safe operation of gathering and transportation pipelines, which is beneficial to ensure the safety and economy of gathering and transportation pipelines.