The Warring States tombs in the Majiayuan site are very important with regard to the study of the Chionite culture and the cultural exchange between the Qin and the Chionites. Some extremely mineralized silk textile fragments with intact fiber shapes were found on the surface of iron objects in the tomb M21 in the Majiayuan site. These mineralized crusts provide valuable information for studying the early silk weaving technology. In this study scanning electron microscope (SEM) and high performance liquid chromatographymass spectrometry (HPLCMS) was used to analyze the mineralized textile fragments. It is found that 1) the morphology of hollow in the mineralized textile was similar to that of a silk fiber, and 2) three groups of peptides characteristic of silk protein. The results demonstrated that the raw materials of the mineralized textile fragments in tomb M21 were silk fibers (from Bombyxmori). The excavation of silk at the MajiayuanSite suggests that the silk products or silk fibers had entered the Chionite regions and that the exchanges between the Chionite culture and Zhongyuan (inner land) culture were close. The use of silk to decorate or wrap iron objects indicates that the Chionite culture has been influenced by some Zhongyuan customs.This finding not only fills gaps in knowledge of the textile research at the Majiyuan site, but also provides technical support for the analysis mineralized silk textile relics.