To make the numerical control machine precision design have quantitative theoretical values for reference

the kinematic accuracy mapping model of NC machine tools based on the meta-action unit is established from the perspective of motion. The functional decomposition method of "Function-Motion-Action

FMA" is used to obtain the meta-action unit

and the topology of the NC machine tool is described in combination with the multi-body system theory. Using the theory of spin quantity the error of NC machine tools is modeled

the spatial kinematic error model of NC machine tools is established

and the comprehensive value of spatial kinematic error by spiral theory is obtained. Based on the manufacturing cost

spatial kinematic error pitch and its size

the kinematic accuracy mapping model is constructed

and the NSGA-II genetic algorithm is used to map the kinematic precision of NC machine tools. Finally

the kinematic accuracy mapping of a domestic machining center is solved

and the feasibility and effectiveness of the model are illustrated.