There are two genetic basis of wide adaptability in Xinong 979. One is that the developmental traits of springness is combined with creeping seedling,and the linkage of springness and cold resistance in development is broken; the other is that,in population,the adjustment ability is strong and comprehensive resistance is well,and many fine traits of parent are synthesized in breeding. With the general trend of climate warming,maturity accelerated by adjusting the growth will become the breakthrough point.