Abstract: The compressibility of intact, compacted, and reconstituted specimens of Jingmen weak expansive soil were investigated by one-dimensional compression-unload tests over effective normal stress range 0 ~ 4000 kPa. The peak, fully softened, and residual drained shear strengths of Jingmen weak expansive soil were measured at low (6.5 ~ 50 kPa), intermediate (50 ~ 400 kPa) and high (400 ~ 800 kPa) stresses. The conclusions are drawn as follows: (1) The one-dimensional compression lines of intact, compacted, and reconstituted specimens intersect at 1200 kPa, and the line of compacted specimen is always lying between the lines of intact and reconstituted specimens. The compression line of reconstituted specimen coincides with intrinsic compression line (ICL). The compression lines of intact and compacted specimens cross the ICL and then bend down. The swell sensitivity of intact specimen is greater than that of compacted specimen, which means greater bonding in intact specimen. (2) The peak drained shear strength of intact specimen at low effective normal stress is strongly affected by its structure. The ratio of peak strength to residual strength can be used as an impact index of 'structure'. The peak strength envelopes of intact, compacted, and reconstituted specimens are all linear throughout the whole stress range, and the three effective friction angles are almost the same (25.0 ° ~ 25.7 °). Effect of soil structure on peak strengths of intact and compacted specimens is reflected in effective cohesions, which are 29.6 kPa and 15.2 kPa, respectively. The residual strength envelopes of intact and compacted specimens are almost the same throughout the whole stress range. However, the residual envelopes are stress dependent at low stresses, which can be perfectly described by the power function.