Abstract:In the order to understand the function of EgrSuSy gene families, eighteen members of SuSy gene family were screened from the genomic database of Eucalyptus grandis, namwed EgrSuSy 1-EgrSuSy18, the gene characters and expression patterns were analyzed by using bioinformatics methods. The results showed that EgrSuSy genes distributed in 7 chromosomes, and the EgrSuSy proteins were located on the cytoplasmic membrane. All of the members of the family had not signal peptide. The proteins encoded by EgrSuSy genes were composed with alpha helix, extending chain, random coil and beta corner. Phylogenetic analysis showed that EgrSuSy proteins had close relations with those in Populus trichocarpa. The expression pattern of 18 EgrSuSy were different among tissues, such as immature xylem, mature leaf, phloem, shoot tips, xylem and young leaf. Therefore, EgrSuSy gene would play different roles in different tissues and development stage.