Abstract: Using bioinformatics methods, DELLA protein family members were analyzed from Camellia sinensis (L.) O. Ktze. genome-wide database, and their phylogenetic relationships, protein sequence characteristics, gene expression specificity, and correlation with secondary metabolites of C. sinensis were analyzed. Results identified five DELLA genes in C. sinensis: i.e., TEA009882 (CsGAI), TEA022818(CsRGA1), TEA010112(CsRGL1), TEA008736(CsRGL2), and TEA020933(CsRGL3). The number of amino acids encoded by DELLA genes ranged from 525-594 aa, all of which were located in the nucleus. Results also showed a large number of α helices and several β corners in the secondary and tertiary structures of the DELLA proteins in C. sinensis. Based on conservative domain analysis, the DELLA proteins showed high conservation in C. sinensis and Arabidopsis thaliana, with GRAS, DELLA, and other conserved motifs. Gene expression specificity showed that the expression levels of the TEA009882, TEA022818, and TEA010112 genes were high in different tissues of C. sinensis, whereas the expression levels of the TEA020933 and TEA008736 genes were very low. The expression of DELLA protein genes was regulated by abiotic stresses, such as drought, NaCl, low temperature, and methyl jasmonate (MeJA), and gene expression was correlated with the accumulation of secondary metabolites. It is speculated that DELLA genes in C. sinensis plants are widely involved in morphogenesis, abiotic stress responses, and regulation of secondary metabolite biosynthesis in C. sinensis.