Abstract: By using 2,6-Diehlorophenol indophenol titration method and 3,5-Dinitrsalieylic acid eolorimetry method, the content of vitamin C ,the deoxidized sugar and the total sugar of common fresh carrot and dehydrated carrot were measured and compared. The results showed that the contents of vitamin C in the fresh carrot were higher than those in the dehydrated carrot, but the deoxidized sugar and the total sugar in the fresh carrot were lower than those in the dehydrated carrot. This experiment also analyzed the characteristic and dominant position of dehydrated vegetables, and supplied reference for people to use dehydrated vegetables reasonably.