The energy index pF of the soil water, which has been established by Schofield and the followers, plays an important role in interpreting the structure and the behaviour of the soil. In this paper, it is noted that there are four important factors determining the energy states of the soil water, the capillary action, the osmotic pressure, the interaction between the soil particles and the water, and the intersticial pressure. The pF-water content relation was calculated under the simplified assumption of the dispersed uniform particles. Thus it was revealed that the pF-water content relation is greatly affected by the degree of dispersion of the soil particles or the structure of the soil. The Kanto Loam has a well dispersed and close-packed structure, because they mainly consist of fine particles and have highly active surfaces. The water confined in the well-dispersed soil aggregates is made free by the disturbance. The existence of such confined water in a large amount is one of the characteristics of the Kanto Loam.