The thin-walled structures are widely existed in complex machined parts, such as aircraft structural parts. The thicknesses of the thin-walled structures are hard to achieve because their machining is subject to deformation. Therefore, the machining features of complex parts are usually manufactured by several machining operations. In order to adjust the tool path according to the feedback of in-process inspection, a function block-based approach is proposed for real-time operation planning. After process planning, the sequenced ideal machining status of a dynamic feature is embedded in a function block. The deviation between the actual intermediate status and the ideal intermediate status of the dynamic features are computed as the event to trigger the function blocks to adjust the unexecuted operations. How the function blocks are designed and how they can achieve the operation adjustments are described in this paper.