Abstract: To provide scientific evidence for varietal verify, distribution and application, the data of 2006 spring millet varieties in middle to late maturity group in northwest regional trial of china were studied by means of nonparametric statistics methods. The results indicated as the following:(1) Changnong 36 and Chang 0301 are two high-yield group, the frequency value of P i (%) and P’i(%) of the varieties, which yields is lower and prominent lower than them, were 71.4, 71.4 and 70.1, 68.8 respectively.(2) The stabilization of yield hasn’t prominent difference. (3) The prominent difference frequency Dj reach 90% in most regions, and some regions reach 100%. This result indicated that the distinguish of varieties difference in diverse regions is high.