The study on prediction of ore-drawn grade for block caving method aims at both improving the prediction accuracy of ore-drawn grade and reducing ore loss and dilution.According to the ore-drawn height of 120 meters for block caving in Tongkuangyu Copper Mine,the physical simulation experiment of ore-drawn was carried out.Both on the statistics and the regressive analysis were made on the particle components of each layer(13 layers totally and different particles having different colours) of above ore-drawn point for different volume of ore-drawn.A grade prediction model for any stage of ore-drawn was suggested.The grade prediction accuracy of the model can reach over 85%.So the problem that original ore-drawn grade computation model can not predict the ore-drawn grade at any stage of ore-drawn has been solved.