Abstract: Based on the results of the long term and position research, the soil moisture content in the soil profiles that covered stubble differ from the soil moisture content in bare profiles. Compared with the former, the soil moisture content has no obvious horizon variety in bare profiles but it is greatly influenced by the precipitation and evaporation. The variable range of soil moisture content distribution is obviously because the situation of stubble cover and soil physical features are different. Compared with the Check, the covered stubble has higher soil moisture content, the maximum is 18% in 0~40cm soil layer in shooting stage. In seedling stage, corn root was mainly in 0~30 cm and the root length was very small. Root length dramatically increased in booting stage and filling stage and root mostly distributed in 0~60cm and 0~90cm soil layer, respectively. The covered stubble could increase water utilization and the capability of storage water and, it could prompt the root growth of spring corn obviously and raise the per unit yield of 32.1%.