This study mainly analyzed the effect of NaF and LiF on the hydrogen release properties of NaAlH4 and LiAlH4 by PCT (pressure-composition-temperature) apparatus. The results show that doping with NaF causes an obvious increase of the hydrogen release amount of NaAlH4 except for the doping with 0.5 mol%, 4 mol% NaF. In addition, the doping with NaF induces an increase of the hydrogen release rate in the first stage. Among all the samples doped with NaF, the sample doped with 1mol% NaF presents the optimal hydrogen release properties with the largest hydrogen release amount and the fastest hydrogen release rate. Comparatively, the results from the study on the LiAlH4 doped with LiF show that doping with LiF decreases obviously the hydrogen release amount of LiAlH4