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For solving the problem of unclosed image edge of diamond particle,a new measurement method for diamond particles based on Hough transform is proposed.First of all, the images are preprocessed by morphological denoising,smoothing and Canny edge detection,and the?initial?edge?curves?of?the?diamond?particle?image can?be obtained.Secondly,?Hough transform is applied to the extract straight-line features of edge curves,and multiple straight-line features is estimated and graphically recognized by the polar radius and polar angle for the edge contour of diamond particles. Finally, the?resulting?edge?profile?is?fitted, and the?parameters of diamond particles, such as particle? size,ovality?and?roundness,and so on,can be measured.This method?has?been experimentally verified in VC+ environment?with OpenCV. The?results?show that diamond?particles characteristic?parameters?can be mesured quickly?and?accurately by using this method.