Abstract: The incremental oil by chemical?flooding process is the main appraisal index for the process effect and the scientific basis for its planning. This prediction method for incremental oil by chemical flooding process in Shengli oilfield is based on the analysis of incremental oil rules at all the chemical?flooding blocks in this oilfield, considering the reservoir conditions of blocks, the different development stages and methods of chemical?flooding process. For converting into water flooding projects the decline method should be used to predict the in?cremental oil; for polymer flooding projects the analog method should be used; for two?compound?combination flooding the numerical simulation method should be adopted. These prediction methods are proved to be more comprehensive and accurate for prediction of incremental oil in Shengli oil field