Global warming and energy shortage are the main challenges and puzzles that government and the public around the world are facing. It is believed that one of the solutions is to use biomass as a potential renewable energy resource for producing liquid fuels such as bioethanol and biodiesel. Bamboo,with cellulose and hemicellulose as its main components,is a kind of fast growth and cheap renewable resource for bioethanol production. In the study,inorganic salts were studied as promoter in the dilute acid pretreatment of moso bamboo for the enzymatic saccharification. The chemical composition of the substrates and spent liquors,the enzymatic hydrolyability of substrates were analyzed. The results showed that dilute acid pretreatment (DA) enhances the digestibility of lignocellulose mainly by dissolving hemicellulose and partially prehydrolyzing cellulose. DA has no delignified. The cellulose-to-glucose conversion yield of 2% sulfuric acid(w/w) pretreated substrate was 52. 72%. Sulfuric acid with Fe_2 (SO_4)_3 pretreated substrate had the higher celluloseto- glucose conversion yield than sulfuric acid pretreatment. Other metal salts pretreatment efficiency was lower than sulfuric acid pretreatment. And the worst one was CuSO_4. Otherwise,the copper could be absorbed by bamboo during pretreatment and desorption into the hydrolyzate after enzymatic hydrolysis.