Abstract: An identification and treatment method of extra high grade value based on the fractal theory was proposed,aiming at the problem of an unreasonable parameter selection and the average grade value declines.The method adopts content-sum method to determine the lower limit of extra high value,and then use the average value to replace it.The method was applied to the identification and treatment of extra high grade value in an open molybdenum ore,and grade estimation by Kriging interpolation.The results suggest that the effect of interpolation of the method is superior to the 3σ method and distribution function method,and can better reflect the original distribution of the molybdenum ore grade.It demonstrates that the method is feasible and effective.