Taking the scarf repair of AS4/3501-6 materials as the research background，based on the time-dependent properties of the thermodynamic parameters of materials， the finite element model of thermal-mechanical-chemical multi physical field was established for the patch and the adhesive layer. The effects of different scarf angles and adhesive layer thickness on the residual shear stress of the adhesive layer were studied and the residual shear stress distribution of the adhesive layer under different program was explored. The results show that the residual shear stress concentration of the adhesive layer will be aggravated by increasing the scarf angle and the thickness of the adhesive layer.The residual shear stress and the radial average shear stress gradient along the adhesive layer can be effectively reduced by reducing the scarf angle； The residual shear stress at the radial midpoint of the adhesive layer is 17% lower and the radial average shear stress gradient is 92% lower for 3° scarf angle than that at 15° scarf angle； When the thickness of the adhesive layer is reduced， the residual shear stress of the adhesive layer decreases，while the average shear stress gradient increases. For 0.3 mm adhesive thickness， the residual shear stress at the radial midpoint of the layer is 15% lower and the average radial shear stress gradient is 30% higher than that for 1.5 mm adhesive thickness. It is verified that the 3D finite element model and calculation method are correct， which provides a basis for improving the repair process and improving the repair quality.