Using experimental data observed in wheat and peanut field,the function of super water absorbent resin to cultivated crop in droughty conditions is analysed.The result shows that super water absorbent resin is a effective drought resistance resin,and it can keeps soil humidity and elevates utilization rate of rainfall.Its price is cheap,and it is easy to use in cultivated crop.If it can be extended into the all crops,the more effect can be available.