The crystalline polymer ultra-thin film typically exhibits different dynamic and static characteristics from its body due to the restriction of the surface or interface.Among them,the crystal orientation of molecular conformation has an important influence on various properties of the crystalline polymer thin film.The orientation of the polymer film is influenced by many factors,such as,the film thickness,the crystallization temperature and the polymer/substrate interface interaction.Based on this situation,my experiment mainly studies the lamellar orientation of poly(3-hydroxybutyrate)(PHB)determined by the temperature and the thickness of PHB and PVPh.