Abstract: Blisk is a key component of aeroengine. NC polishing with super-hard abrasive flexible polishing wheel has become an effective way to replace manual polishing and improve the surface quality of blisk. In this paper, the equivalent diameter and polishing force model of the flexible polishing wheel with complex generatrix super-hard abrasive is analyzed, and established to optimize the geometric parameters and mechanical properties of the polishing process. Among them, the geometric parameters of the polishing wheel are converted into mechanical parameters by force measuring instrument, the equivalent parameter calculation model is established, and the equivalent diameter of the polishing wheel is obtained by inverse deduction of the relationship, so as to improve the polishing measurement deviation caused by the dynamic diameter measurement inaccuracy. A single factor orthogonal experiment was designed to measure the polishing force under different processing parameters, and the influence of each factor on the polishing force. Then, under the stable working state of the polishing wheel, an empirical model of the polishing force was established, which can be used to predict the real polishing force in the NC polishing process of the blisk. The experiment proves that the accuracy of equivalent diameter is 2.02% higher than that of dynamic measurement, and the actual value of polishing force and model fitting value fit very well, with the correlation coefficient reaching 0.999.