Abstract: Aiming at the estimation of the muck-pile shape in the cast blasting process, a convenient method is proposed.Only the similar multi-source data can be used to obtain the accurate prediction result.The method of estimating the muck-pile shape is proposed as “data sampling-fusion accuracy discrimination-data fusion optimal weight calculation-get data fusion result”, and the data sampling rules are established, the method of precision discrimination and the method of determining the optimal weight are deduced.Taking the cast blasting project in Heidaigou open-pit mine as a research case, the method of data fusion and Weibull distribution prediction are used to calculate the volume in dragline system at 12-14 m of dragline operation bench.The results show that the error of data fusion algorithm can be controlled within 5%, which is better than Weibull distribution prediction method, which can meet the requirement of satisfying the accuracy of field calculation.