Abstract: The fenumgreek gum was degraded with acid assisted by microwave radiation for the first time, and compared with the degradation process by water bathe.The influence factors of the reaction on the degradation process under microwave radiation were studied and low molecular weight fenumgreek gum(LMWFG) was obtained.The crosslinking process of LMWFG with borate was investigated furtherly.Effects of fenumgreek gum concentration,borate concentration and pH on the formation of the crosslinked gel systems were also investigated,and the stable low molecular weight fenumgreek gum cross-linked gel system were prepared. Moreover,the rheological properties of the low molecular weight fenumgreek gum cross-linked gel systems were researched.The results show that,the degradation of fenumgreek gum by acid assisted with microwave radiation is a novel method,and the degradation rate is higher than that by water bathe significantly.Under proper alkali condition,the low molecular weight fenumgreek gum may be cross-linked well with the borate to form stable gel systems,and these gel systems possess viscoelasticity and shear thinning property.