Abstract: Testing of cracked particles of rice is one of major contents in rice quality testing. By applying the technique of computer image processing, three methods for testing the cracked rice particles-histogram Fourier coefficient decision method, histogram peak detection method and gray-eruptive decision method, which are different in recognition function, testing precision and symplicity, are described. The testing result of 798 samples of 8 varieties shows that testing of cracked with computer visual perception instead of sense organ is feasible.