Abstract: Abstract：Raman spectra and X-ray power diffraction(XRD)were used to study the process and products of thermotransformation of serpentine cat’s eye，which was firstly discovered at the asbestos deposit of Shimian town，Sichuan Province，Southwest China and could display excellent cat’s eye effect if polished properly．The results show that the final products of thermotransformation of the Sichuan serpentine cat’s eye are crystalline forsterite and crystalline enstatite．Heated up to 500℃ for two hours, the Raman spectrum pattern of Sichuan serpentine cat’s eye remains intact，indicating its stable internal structure and good resistance to relatively high heat；Up to 700℃ ，the characteristic Raman bands 824 and 854 cm-1 are clearly observed，indicating the appearance of forsterite，along with the appearance of the overlapped bands 686 and 340 cm-1of noncrystalline enstatite; At 800～900℃, the crystallization of forsterite increases，meanwhile，crystalline enstatite begins to appear．When heated to 1000℃ ，the amount of forsterite decreases apparently．Up to 1000℃, the amount of enstatite increases rapidly．