The Devonian cherts profile was developed in Lvhe area, Xunyang basin of southern Qinling orogenic belt, and the microfabric features based on spectroscopy characteristics clearly recorded information of diagenesis and later stage evolution of the cherts. Cherts in Lvhe area, Xunyang basin of southern Qinling orogenic belt were taken as object, by means of Raman spectroscopy, Fourier transform infrared spectroscopy and X-ray powder diffraction, and the results of this study showed that: low temperature quartz and a small quantity of carbonate minerals were the two main mineral phases of the cherts, and XRD analysis further proved the carbonate minerals were dolomites. Within the cherts in Lvhe area, Gauss fitting FWHM and Area values of the 463 cm-1 Raman shift of SiO2 texture confirmed that recrystallization had occurred in the SiO2 minerals. Alone with this process, variations of degree of order were triggered by fluid effects as well as the quartz itself. During the recrystallization process of the quartz, degree of order went up. The cherts were altered by later fluids, apart from the intersected late vein, the alteration reflected in that the closer to the edge of the fluids in the quartz, the higher the crystallinity and degree of order. In this study, alteration of cherts made by orogeny mainly reflected in two aspects: on the one hand, tectonic stress destroyed the continuity of the cherts and provides space for migration and intersection of later stage hydrothermal fluids; On the other hand, participation of the late fluids accelerated the recrystallization of quartz. In this study, infrared spectroscopy is capable of identifying mineral structure type systematically, and Raman spectrum analysis can reveal in situ microfabric characteristics, and XRD shows significant advantage in discriminating trace impurity minerals in cherts. These spectroscopy methods provide important demonstrations in studying the diagenetic evolution of the cherts.