Abstract:Through the establishment of bracken dynamic model of the vacuum freeze-drying of freeze-dried fiddlehead vacuum freeze drying of the dynamics characteristics of research， and compare the freeze-dried fid－ dlehead and hot air dry fiddlehead in senses， water content， water activity， water features， physical and chemi－ cal indexes such as primary nutrients content. The results showed that the freezing temperature， vacuum degree and material volume three factors effect on dry fiddlehead have different degrees of influence； validation equa－ tion coincided basically with the predicted values and experimental values of the freeze-dried fiddlehead more hot air dry fiddlehead closer to the physical properties of fresh fiddlehead more full-bodied flavor and primary nutrients more intacted.