Abstract: In this paper, the test and research on the carrot silk drying made on thermal-airflow drying test-bed were completed. The law of influence of the material-pretreating technology, the temperature and velocity of the drying medium on the drying rate and rewatering of the drying products as well as the contents of vitamin C was obtained. Also the regression equation was set up between variables, based on it the parameters have been optimized and the better drying processing technology has been presented.