Abstract: This paper analyses the processing key points according to the structure and size of a wind tunnel flexible plate of the nozzle. There are some characteristics about the processing of nozzle inner surface, such as difficult to cut, complex processing technology and high quality requirements. Through the equipment design and application of the current equipment, the processing technology is optimized, and the machining requirement is satisfied. It is proved by practice that this kind of technology optimization can make the processing quality of the flexible plate surface satisfying the design requirement, and it can be used for reference to the machining of this kind of part.