Abstract: Aiming at the error evaluation on planar free-form curve profile, a method combined NURBS interpolation and real coding genetic algorithm is proposed for evaluating planar free-form curve profile.Theoretical curve was built by interpolating measure points and reversed calculation control ver-(texes).The genetic algorithm is taken for matching measure points and theoretical curve to avoiding the evalu(ation) error derived from position error.The algorithm of the minimum distance between measure points and theory profile curve is presented in detail in the paper.The experiment results show the(proposed) method can rapidly acquire a better result.