Abstract: In the case of differences in evaluation standards at home and abroad, how to quickly and effectively evaluate reserves is particularly important for the selection of overseas assets. The paper discusses the differences in the definition and classification of reserves between China and foreign countries.According to the analysis, the reserve potential of the asset can be verified by comparing the total petroleum initially in place with the geological reserves, and the evaluation of asset economy is mainly referred to P90, while the profitability evaluation is mainly referred to P50, and the difference between P10 and P90 value ranges can be used to qualitatively evaluate the risk of asset reserves. According to the above methods, asset risks can be better identified, which is convenient for making quick judgments. This paper also analyzes how to quickly evaluate assets under the PRMS classification system based on specific M&A cases, providing reference for the evaluation of similar overseas assets.