Abstract: The measurement system to calculate the volume of the stockpiles by using computer-aided measuring technique is introduced. This system includes taking photos of the stockpile on the spot and scanning the photos into images in the computer to do 3-D reconstruction and volume calculation. In the part of volume calculation, offers in detail a complete set of algorithms which has eight procedures including filtering raw data, constructing triangle grid, computing interpolation points on the contours, searching contours, judging the relationships among contours, fitting contours and calculating contour' area and stockpile's volume. Based on these algorithms, a volumetric calculation subroutine is developed. By measuring a real coal pile, the feasibility and validity of these algorithms is tested well.