Using copper as catalyst, γ-butyrolactone (GBL) can be obtained through gaseous phase or liquid phase catalytic dehydrogenation of BDO. GBL is the second largest consumer of BDO in China. BDO is a highly soluble, non-toxic, safe and convenient high-boiling-point solvent. In organic synthesis, it is used to produce α-pyrrolidone and N-Methyl pyrrolidone and a series of high value-added products such as vinyl pyrrolidone, polyvinyl pyrrolidone and so on are derived, these products are widely used in pesticides, pharmaceuticals, cosmetics and etc.