Background: The extracellular matrix is an essential mierocnvironment for cell survival activity.The adipose tissue extract microparticle scaffolds from human adipose tissue and small intestine submucosa microparticle scaffolds from porcine jejunum were prepared.Their effects on the adipogenic capabilities of human adipose-derived stem cells were compared in vivo.Methods: A combination of physical and chemical methods was used to decellularize human fat and porcine jejunum.Expression of CD molecules on the adipose-derived stem cell surface was determined by flow cytometry.The stem cells were then cultured with the scaffold materials in vitro.The cellscaffold complexes were implanted subcutaneously into nude mice, and samples were collected 4 and 8 weeks ++later.The adipogenic differentiation capabilities of adiposederived stem cells were studied by histologic methods and real-time polymerase chain reaction.Results: The authors observed high expression of CD90 and CD44; no expression of CD34, CD45, CD31, or CD106; and weak positive expression of CD49d on the extracted cells, which indicates that the cells were adipose-derived stem cells.The main constituent of the decellularized adipose tissue extract and small intestine submucosa rnicroparticles was collagenous fiber, and the cells proliferated faster on the adipose tissue extract than on small intestine submucosa.Formation of adipocytes in the adipose tissue extract group was closer to that of normal human fat tissue compared with that of the small intestine submucosa group.Conclusions: Extracellular matrix microparticle scaffolds could promote proliferation, adhesion, and adipogenic differentiation of adipose-derived stem cells.The role of the adipose tissue extract microparticle scaffold in promoting adipogenesis was stronger and more suitable as a vector in fatty tissue engineering.