The application of geochemical precise survey technique to detecting carbon dioxide anomalies is based on the theory of oil and gas infiltration.Using such geochemical comprehensive indices as CO₂ in soil,CO₂ in water,CO₂ alteration,soil total hydrocarbon, mercury,isotopes and fluorescence in combination with geological-geochemical data,we can predict the distribution of CO₂ gas accumulation.Based on an integrated analysis of geochemical data and distribution of gas accumulation in Haugou area of Jiyang depression and a study of regional geochemical background,the authors indicate the regional and zonal anomalies.Taking into account the oil and gas geological and geophysical data,this paper has also made grading evaluation of delineated geochemical anomaly areas,predicted zones favorable for CO₂ accumulation,and probed into the effective application of integrated geochemical precise survey technique to detecting carbon dioxide accumulations.