For the importance of NC machining parameters on the machining process, the adaptive control method of NC machining parameters is elaborated based on fuzzy control theory. According to the established control model and the fuzzy control principle, compiled C + + source procedure, and simulated the experimental data to verify the feasibility of procedures, and finally, embedded the procedures into the existing numerical control system by the VC + + visual software, achieved the dynamic display of adaptive control processing. The results showed that the effectiveness of the adaptive control model and made NC machine maintain the good stability in the whole machining process