To evaluation methodological question of tactical and technical quality index raised in grapeshot type testing for impact points uniformity, two-dimensional uniformity distribution within one circle is divided into one-dimensional radial uniformity distribution and one-dimensional circumferential uniformity distribution to evaluate respectively. MATLAB is applied to achieve a method of compatibility test critical values calculation of one-dimensional uniformity distribution and compatibility test critical values of each sample size are calculated under different confidence level with the method. Sample size of compatibility test critical values has been extended to meet practical requirements that pellets quantities of some types grapeshot are large .