Abstract: The oriental Lilium hybrids‘Siberia’was used as experimental material.The physical and chemical properties,secondary structure,phylogeny,conserved domains,Motifs and gene expression patterns of SWEETgene family members in Lilium were studied by bioinformatics,the SWEETgene family members of Lilium were identified and explored their role in steam bulblet development,in order to provide reference for the biological function of these genes and further study in molecular mechanism of bulblet formation.The results showed that 12 SWEETgenes were identified from the transcriptome data,and all the proteins of the family members were relatively stable hydrophobic proteins,and all contained the MtN3＿slv domain,which could be divided into 4subfamilies.Different gene family members performed different expression level during bulblet formation and development stage.