The time course of fructose dehydration over Zr-P-Cr catalyst was also recorded and HMF yields at different reaction time points are depicted is .. . It is observed that HMF yield increased with an increase of reaction time, and then it reached the maximum of 86.3% Seeing from ... . HMF yield increased faster at an early reaction stage from 0h to 1h. The reason was due to the high doncentration of fructose at the early reaction stage. After 2h, HMF yield gradually decreased, and HMF yield decreased to 62.4% after 12h> The blank experiment of the dehydration of fructose with Zr-P as the catalyst only prouced HMF yield in a low yield of 5.6% after2h (... ,Entry 5). Compared the reaults obtained from Entry 3 and Entry 5, it can safety conclude that the introduction of Cr in the ZrP-Cr catalyst was the active sites to promote the dehydration of fructose. Prolonging the reaction time of fructose dehydration over Zr-P catalyst to 12 h, HMF yield slowly increased to 24.2% (... , Entry6). The results on surface of Zr-P also have the ability to catalyze the dehydration of fructose into HMF, but the activity of Zr-P was much weaker than that of Zr-P-Cr.