Cultivation of the spring wheat ecotypes with different drought resistances,sterility tolernce and high water use efficiency is an important approach to realize self-supplying of grain food,returning farmland into grassland and woodland,recovery of vegetation,reduction of water loss and soil erosion.Through the study on 21 characters of spring wheat ecotypes with different drought resistances and sterility tolerance,the results shou that the major characters of causing variances of different ecotypes,firstly were the ratios of the number of two-grain spikelets,the number of four-grain spikelets and the number of three-grain spikelets to the total spikelets nmber of an ear respectively;secondly were plant height and the ratio of plant pattern.the basic characters of ecotypes with drought resistances and sterility tolerance were no (or few) four-grain spikelets,a lot of two-grain spikelets,a low grain count,low ratio if plant pattern,relatively plant height great,small flag area and high index of earinternode.It was ontrary to the ecotypes adapted to growing in wet and fertile soil.And it was the two aspects above that intermediated ecotypes.