Abstract: Condensate gas in Yakela Condensate Gasfield in Sichuan Proyince is characterized by higher CO₂ contant, higher velocity and stronger erosion of the gas resulting in serious corrosion in gathering line. In the light of the problam, two models to predict corrosion, Waard Equation and Predict 4, are adopted for actual case calculation and analysis. Corrosion state, corrosion behavior and corrosion tendency based on calculation results obtained ftom different models are pointed out and corrosion control countermeasures for in-service pipeline and newbuilt pipeline are discussed. Available corrosion prevention measures is worked out through program comparison and optimization for gas gathering lines in Yakela Condensate Gasfield.