A feature-based 
skin mirror-image milling technology decision method includes, firstly, inputting part information, 
processing feature information and bent frame information, and automatically dividing a 
processing area according to area division rules; secondly, performing feature reconstruction on each divided area according to recessed-
surface reconstruction rules; thirdly, 
ranking reconstructed features, and automatically deciding 
processing sequence and technological parameters; fourthly, constructing a technological recessed surface according to the technological parameters; finally, automatically deciding engagement and retraction parameters and 
machine-tool control commands for processing features according to 
skin mirror-image milling 
programming specifications. The method has the advantages that effective information link connection during 
skin part 
numerical control programming is realized by feature-based automatic technology decisions, feature-based 
numerical control programming in skin mirror-image milling is realized by combining the skin mirror-image milling 
numerical control programming specifications, dependency of programming on human experiences is weakened, programming standardability is guaranteed, programming quality and efficiency are improved, and 
production schedule is guaranteed.