<p>Shear-induced wear and roughness degradation significantly affect fluid migration and heat transfer behavior of heterogeneous fractures. In this paper, the shear behavior of a single fracture in a heat-treated rock was experimentally analyzed, and the surface geometry of the heterogeneous fracture was determined using three-dimensional scanning. Subsequently, a finite element model considering wear and the coupling of seepage heat transfer was developed to analyze the temperature and flow fields of the heterogeneous fracture, quantify the degree of wear in the shear behavior of the heterogeneous fracture, and refine the evaluation method of roughness degradation and the correlation between wear coefficient and with shear displacement and rock temperature. The results indicate that the shear stress exhibits an inverse and progressive distribution along the fracture direction, and the flow and temperature fields in the groove region of the heterogeneous fracture demonstrate localized heat accumulation. The wear behavior of the fracture surface is strongly influenced by the surface geometry; the wear depth increases with shear displacement, and the wear volume is positively correlated with fracture roughness. These findings contribute to the optimization of the design and operation of heterogeneous fractures, which can positively influence the efficiency and safety of resource utilization.</p>