In soda-alkaline upland fields that had been washed and leached with brackish water and were different in alkalinity, moderate and slight, an experiment was carried out on effect of deep tillage on physic-chemical properties of the soil, including bulk density, soil salinity, pH etc., crop yield and related characters. Results showed that deep tillage reduced soil bulk density, salinity and pH effectively, stimulated root development and increased crop (Sorghum) yield. Deep tillage might be applied as a effective way to ameliorate and utilize soda-alkaline land. Deep tillage to the depth of 40 cm in old furrows and 30 cm in furrows for intertillage is the most effective and workable.