The agricultural excessive dependence on rainfall.Drought is a serious problem for agriculture in arid,semiarid region northern of China such as regions along the Great Wall,which could lead to difficult emergence and seedling planting problems.In this study,soil columns were used to simulate drought environment artificially,different rates of KPAM were applied to improve the soil pore and water content,and CT techniques was used.This research aimed to provide a theoretical basis for the water conservation.4 KPAM application,0(CK),0.02% (A),0.06% (B),0.10%(C)were set in this experiment.The results show that:The KPAM increased the soil pore number in 0~10 cm.1.0~2.0 mm pore number was the dominate pore equivalent diameter in all layers of each soil.With the increasing of KPAM application rate,the various pore number increased first,then decreased,and it was the highest in the treatment B.The soil compaction in 0～10 cm after the emergence 6~7 d difference increased gradually in drought condition with the seedling growth,and reached 1 632.8,1 944.3,2 198.5,1 400.7 kPa for treatment A,B,C,CK,respectively.When the application of KPAM was less than 0.06%,soil water content was higher than that of other treatments in 0~10 cm soil layer.In dry conditions,low application of KPAM was more helpful to emergence.It was concluded that reasonable application of KPAM could be useful for water conservation and improve the rate of emergence and yield.