As an efficient and cost-effective new process method, near-net shape blade is increasingly being used in the manufacture of aero-engine blank. For aero-engine near net-shape blade, which is complex and thin-walled part, it is not possible to ensure that all areas are formed at once and meet the design accuracy requirements, and adaptive machining of the leading/trailing edge areas is required. The leading/trailing edge surfaces in adaptive machining are often reconstructed surfaces that have large curvature variations and uneven boundaries due to measurement data, leading/trailing edge areas shape constraint, blank deformation and other factors. To address the above problems, this paper analyses the geometric relationship between tool centre path and machined surface, and establish a planning line planning algorithm for the smooth tool centre path based on the smooth offset surface to achieve efficient automatic generation of smooth tool centre path for reconstructed surface. The experimental results show that the surface contour tolerance is controlled within the range of (–0.02~+0.039) mm to meet the requirement of the design tolerance (–0.03~+0.05) mm, which proves the effectiveness and practicality of the proposed method.