Airfoil is the basic unit of wind turbine blades and plays a decisive role in blade performance.For the study of inverse modeling and redesign of blade structures,a method that combined airfoil extraction and design intent into blade inverse modeling was proposed.A laser scanner was used to extract the blade model,and the blade model was processed in Geomagic Design X.Through the coordinate system alignment of the blade model and the extraction of geometric features of the section profile,parameters such as blade thickness and chord length were measured,and the airfoil type of the section profile of the blade was derived.The airfoil curve expression was then used to calculate the key points which the contour curve passed through,and the blade cross-section contour line was obtained by fitting the key point positions as constraints,and its solid model was established.Through body deviation detection,it can be seen that this method can be used to obtain a CAD model that conforms to the airfoil characteristics and forward design intention under the condition of meeting the tolerance requirements,which verifies the feasibility of the method.