Abstract: The experiment was conducted at Yucheng Comprehensive Experimental Station to study the effect of different soil moistures before sowing(SMBS) on water consumption characteristics and yield of summer maize. The experiment showed that with the depth of soil, soil moisture inclined to stabilization, but SMBS affected soil moisture of every layer and consuming water depth of summer maize. In 60～90 cm, when soil moisture content is less than 27.7% and soil without irrigation in wheat growth stages, summer maize began to utilize deep water, the summer maize, which SMBS is relatively large, can reach 1.1 m soil depth. When soil is irrigated twice in winter wheat growth stages, additional irrigation in summer maize can increase maize yield notably; When soil is irrigated once in winter wheat growth stage, the function of additional irrigation is not greater than sufficient SMBS. After soil irrigated at heading and grouting period and 150 mm water in summer maize growth stages, the treatment gained maize kernel 7466.58 kg/hm². After irrigated at jointing, heading and grouting period in winter wheat growth stages, but without irrigation in summer maize growth stages, the WUE of the treatment was 33.34 kg/(hm²·mm).