5-Hydroxymethylfurfural (HMF) is a new platform chemical, from which hundreds of high value-added chemicals can be derived. However, the reported HMF preparation is generally carried out under high temperature. The high energy consumption limits its large scale production. Aiming at the limitation, the author of the present thesis carried out the following research works:1. Room-temperature ionic liquid system converting fructose into HMF in high efficiency.The dehydration of fructose into HMF promoted by i...