The location observation of soil moisture at different layers from 0 cm to 200 cm have beenmade. It was concluded that the soil moisture dynamics within a year can be divided into four peri-ods in arid plain, i. e.,intensive consuming period in late spring and early summer,resuming andreplenishing peroid in rainfall season,slow consuming period in late autumn,relative stable periodin winter and early spring. The vertical distribution of soil moisture can be divided into three sec-tion,i. e.,quickly changing layer (0-20cm),brisking layer (20-100cm) and relative stable layer(100-200cm). On the basis of these results,special subjects have been taken to study tillagetechniques of storing Water and conservating soil in arid plain. The results were shown as fol-lows,in arid plain,the intercropping of sun flower and soybean in belt shape produces remarkablebenefits for soil and water conservation and economy;the objectives of saving on manure,improv-ing the utilization of manure and increasing yield could be obtained by popularizing the techniquesthat make up a prescription for manure-spreading.