Change of the linear relationship between CT value and major internal components of Fushi apple during storage period was discussed. CT images and CT value were acquired by scanning the section of Fushi apples, and the model of linear relationships between CT value and major internal components was established. The linear relationships in different storage time were compared. It’s clear that the pH value and sugar content increased with the growth of storage time, while moisture content and titrable acidity decreased. The linear relationships have been changed during the storage period. So the storage time was introduced into the predicting model, which was used to predict the internal components of Fushi apple. The predicting model was proved to be accurate and feasible.