pieces of Xuejiagang jades preserved at the Institute of Archaeology of Anhui Province and Museum of Anhui Province were analyzed to study the carving technology of jades.Stereomicroscope was used to observe the surface micro traces.X ray diffraction analysis,infrared spectroscopy and Raman spectroscopy were performed for phase studies.The results show that Xuejiagang jades are almost plain,without surface pattern.The jade material is mostly nephrite of a crude structure.The opening technique is mainly line cutting with piece cutting as a supplement.Holes were mainly drilled from both sides,and the tools used were both solid drills and hollow drills.There are spiral drilling traces and two surface drilling traces left on the hole wall.The entire jade had been burnished and polished.Broken jade could have been joint repaired.Techniques such as hollow carving and bas relief by reducing and line incising appeared in the late Xuejiagang culture,reflecting remarkable progress in carving technology.