Abstract：The experiments used to detect the characteristics of soil under the condition of principal stress rotation are analyzed systematically. Some conclusions have been drawn as follows. Under the condition of undrained principal stress rotation the pore pressure is generated and accumulated，which is especially obvious in the cyclic rotation；and the pore pressure is usually larger than that in the dynamic triaxial or torsion shear test at the same level of the shear stress. Besides，the mode of the pore pressure accumulation has a certain functional relationship with some kinds of strains，and is influenced by the inherent anisotropy of soil，but this influence is also inhibited at the low level of the shear stress. During cyclic rotation the pore pressure is also influenced by the rotation amplitude，frequency and cycle times. The cyclic stress rotation does not obviously change the effective internal friction angle of soil，and quite a few tests show that whether the soil has experienced principal stress rotation or not，the normalized shear strength criterion is same. But some results convince that the axis of inherent anisotropy can rotate with the rotation of the principal stress under drained condition，which leads to the different shear strengths before and after rotation. During the principal stress rotation the direction of the principal strain increment is between those of the principal stress and the principal stress increment. The degree to which stress-strain relationship influenced by the principal stress rotation as stress history is mainly dependent on the strain level having accumulated during principal stress rotation. The suggestions to bring pore pressure，strength，and stress-strain relationship into consideration on the further experimental study are also put forward. The higher shear stress level is，the higher frequency tests should be taken and the influences of specified stress factors on the properties of the soil under principal stress rotation need to be further investigated.
