Based on the problems of that drought and water shortage existence at the same time in the north partial area of our country, the decrease of the ability of soil infiltration and the low utilization of natural rain resource in agriculture production, we do the research on the mechanism of the process of soil water storage and quest the effect of soil constitution and structure on the process of the loess soil infiltration-storage-evaporation. By the different level of soil bulk density which was completed i...