Natural soils usually exhibit initial structure and anisotropy. The strength and deformation of natural soils normally differ from those of the remoulded soils under complex stress path. The mutual effects of the structure
initial anisotropy and complex stress path make it complicated and difficult to determine the progressive destructive strength and parameters of natural soils. The analytical solution to the progressive destructive normalized undrained strength of anisotropic natural soils is derived. The dependency of the progressive destructive normalized undrained strength of natural soils on the initial anisotropy
progressive destruction ratio and stress path is investigated.