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The safety control is the key in the cold chain of fresh products, which includes the prediction of the store time and the management of the instant temperature. Based on the energy conservation theory, the equation of the rest store time of fresh vegetables and fruits was derived stored in 0℃. According to the present data about 8 kinds of fresh vegetables, we obtained the equation for the relationship between the store time and the storing temperature and the equation predicting the left store time at 0℃. The storing experiments for celery at 0℃, 2℃, 4℃, 6℃ and 8℃ proved that the store time calculated by the equation is about the same as the experiments with the difference of less than 2 days at each storing temperature. Combined with the wireless technology of sending messages, the predictor of fresh vegetables and fruits with a management function of stock was developed. The practical application shows that the predictor has a fine precision. 