Abstract: In order to appraise the performance of proppant scientifically and accurately，both of the theoretical analysis and the experimental method are used by solving binaryzation of the digital image of the particle projection，using the two algorithm of chain code，calculate the coordinates of the border points and coordinate-labeling-automaton of the distance between two points on the border，to obtain image geometric characteristic directly.An algorithm has been inferred for the sizing of fracturing proppant.The solution process for sizing of the fracturing proppant has been confirmed experimentally.The results indicate that the algorithm for the sizing and averaging measurement and analysis can be considered as the rationale for the particle pattern recognition and analysis system.Conclusively，this technology broke through with the sieving methods in measuring，which will provide support for the application of computer image analysis technology.