Loess is a typically structured soil.The study on loess soil structure is an important aspect of soil structureresearch

contributing to the broader understanding of soil structural properties. This paper draws on primary data collected from confined compression tests of unsaturated loess

including intact loess and anthropogenic modified loess

and discusses the key influences on changes in the st ructural properties of unsaturated loess. Research results indicate that increasing vertical pressure

increasing water content and increasing soil density promote gradual structural weakening of unsaturated loess; and the structural integrity of the loess is reinforced in some instances by the increasing of cementing agents. Other important findings are that the key influences on loess structure are not uniform across loess regions

and that achievement of higher loess structural integrity is difficult under very high and very low clay content.