Graphites are widely generated in geological processes of magmatism, metamorphism and hydrothermal alteration & metasomatism, and considered to be an indicative mineral for these geological processes. Xiuyan nephrite jades (locally named Laoyu), especially gravel nephrite jades, in Liaoning province, commonly contain graphite as internal enclaves. The study of these graphites will contribute to understand the formation of their host nephrite jades and the relationship between graphite enclaves and their host nephrite jades. In this paper,microscopic observation, Raman spectra and X-ray single-crystal diffraction are used to study graphites in host nephrite jades from Xiuyan, Liaoning, and the genetic relationship between graphites and their host nephrite jades. The results show that crystalline graphites commonly occurred in three clustered patterns of stripped, star-like and nebulous, in their host nephrite jades, and contained 19.52%～23.00% graphites in rhombohedral polymorph. The crystallinity indexes of graphites range between 0.562～0.644, and calculated forming temperatures range between 454～623 ℃. The temperatures are identical to those for amphibolite facies, obviously higher than previously reported data of nephrite jades. These results infer that graphites and their host nephrite jades probably formed in different geological processes or periods. Combining field investigation, we think that graphites in Xiuyan gravel nephrite jades were probably the remnant minerals of primary regional metamorphism prior to their host nephrite jades-formation, and Xiuyan nephrite jades formed through multi-stage or multi-period metamorphic and hydrothermal metasomatism processes from Liaohe group primary strata such as graphite & calcite-containing marble, graphite-containing tremolite granulite, or tremolite marble.