Salidroside (SAL),a major bioactive compound of Rhodiola crenulata,has significant anti-hypoxia effect,however,its underlying molecular mechanism has not been elucidated.In order to explore the protective mechanism of SAL,the lactate dehydro-genase (LDH),reactive oxygen species (ROS),superoxide dismutase (SOD) and hypoxia-induced factor 1α (HIF-1α) were measured to establish the PC12 cell hypoxic model.Cell staining and cell viability analyses were performed to evaluate the protective effects of SAL.The metabolomics and bioinformatics methods were used to explore the protective effects of salidroside under hypoxia condi-tion.The metabolite-protein interaction networks were further established and the protein expression level was examined by Western blotting.The results showed that 59 endogenous metabolites changed and the expression of the hub proteins of CK2,p-PTEN/PTEN,PI3K,p-Akt/Akt,NF-κB p65 and Bcl-2 were increased,suggesting that SAL could increase the expression of CK2,which induced the phosphorylation and inactivation of PTEN,reduced the inhibitory effect on PI3K signaling pathways and activated the PI3K/Akt/NF-κB survival signaling pathway.Our study provided an important insight to reveal the protective molecular mechanism of SAL as a novel drug candidate.