Abstract: Based on the optimization of foam-drying the papaya bubble by microwave,the main materials content in the papaya was investigated. The rule of the moisture content and nutrition ingredient content was analyzed and studied under the different microwave power.And the best kinetic equation was verified by appropriate power.The results showed that the predictive value of Page equation model was well fitted for the experimental value when the moisture content was investigated and the R² was 0.9884.The zero order model of content of vitamin C was well fitted for the experimental value and the R² was 0.9702.And the first order reaction was most suitable for the content of carotene and the R² was 0.9185.There was no significant difference between predictive values and experimental values about the equation model. Models could be used to predict the dynamics characteristics of the main materials in papaya bubble in the process of foam-drying by microwave.