Abstract: This study was carried out in Shanxi province from 1983 till 1985. The results are summarized as follow:The values of two yield stability parameters among some hybrids of maize were considerably different in the regional test of the same year; those of the two yield stability parameters of the other hybrids were either significantly or not significantly different in the regional tests for different years, showing that in different years, under different climate and environmental conditions, these hybrids have different yield stabilities and adaptabilities. The experiment proves that only after the regional test, for three consecutive years can the yield stability of new hybrids be more precisely evaluated.This experiment suggests that the correlation coefficients between mean, yields and stability parameters were nonsignificant (rx-·b = 0.0612, r-x ·r2 = -0.2933) . The hybrid yield stability was found associated with the changes of the major agronomic characteristics, especially of the ear characterestics. Among these hybrids, Tai Dan Zao N0.3 was found in the three-year regional test to be a high-yield, stable, and widely adaptable species.This analysis method seems to be an effective tool for breeders to use in studying varietal yield stability and adaptability in the crop variety regional test

Key words: Spring—seeding, Maize hybrids