Abstract:In order to improve the processing effect of coffea arabica，the cracking mechanism was analyzed from many aspects.Through the preparation of coffea arabica samples，the changes of crack number（width greater than 0.1 mm）and maximum crack width in different stages of coffea arabica samples were found by using electronic testing machine，and the changes of crack densification stage，growth stage，stationary stage and non-stationary stage of coffea arabica samples with or without drilling treatment were obtained，as well as the change trend of energy and stress potential.COMSOL was used to analyze the location and number of crack sources of coffea arabica samples with or without drilling.The loss coefficient of internal stress wave and light spot on the surface of coffea arabica samples with or without holes were analyzed.The theoretical results of internal stress of coffea arabica samples were compared with the experimental results.The results showed that the number of crack sources of coffea arabica samples with or without drilling treatment was 1573 and 876 respectively，and the crack degree of coffea arabica samples with drilling treatment was more obvious than that of coffea arabica samples without drilling treatment.According to the loss coefficient of stress wave and the loss coefficient of light spot，the internal stress results of theoretical coffea arabica samples were almost the same as the experimental results.The loss coefficient of stress wave was obtained by SPSS，and the correlation coefficients before and after the stress peak were 0.976，0.912，0.932，0.824，respectively.The correlation coefficients before and after the stress peak were 0.993，0.967，0.973，0.864，respectively.