Abstract: This paper introduces the basic theory and the thought of grey correlation method, through the method of Daqing in 45 block reservoir unit the physical parameters of quantitative analysis, to determine the impact on the quality of the region weights of evaluation indexes, and determine the comprehensive evaluation score and classification standard, through quantitative distinguish coefficient, the correlation coefficient, correlation, and weight coefficient to calculate more reasonable and accurate. The evaluation results are in good agreement with actual production worth popularization and application.