Abstract: Based on the actual demand for the decision of grade estimation method of ore deposit, a decision analysis method and steps based on the Deng's grey correlation degree for the grade estimation of ore deposit is proposed and used in the optimization analysis of grade estimation in the Wulongquan mine.The influence of the change of valuation parameters such as the block dimension, estimation methods, the length of the combined sample, the search distance and the search strategy on the grey correlation degree of grade estimation scheme of deposit grade is analyzed.The key factors determining the choice of the scheme are the combined sample length and search strategy based on the rate of grey correlation change rate.According to the occurrence characteristics and ore-matching requirements of the Wulongquan limestone ore body, the final scheme X₂₉ is the best solution.The attributes of the scheme are the block dimension of 10 m, the kriging method, the combined sample length of 3 m, the search distance of 150 m and anisotropy.By comparing the grade test data of the 1^# muck pile with the estimation results based on the grade distribution model, it can be seen that the difference is little.