Abstract: In order to explore the structure and biological iunction of SCD in pig, bioiniormatics software like Expasy and 3opma were used to analyze the amino acid sequence of SCD. The results showed that SCD protein of pig was composed by 359 amino acids, and had a predicted molecular weight of 41.38 ku. SCD had four transmembrane domains,respectively containing one potential O-glycosylation sites, three N-glycosylation sites and 16 phosphorylation sites. Alpha helix, beta turn, extended strand and random curl were the main components of secondary structure. The low complexity and transmembrance region were two functional structures of SCD.