Abstract: In order to study the influences of density and stress level on the strength and deformation characteristics of the coral sand, a series of triaxial consolidation drained shear tests with different densities and stress levels are carried out using a triaxial apparatus. Based on the experimental study results, the effects of the density and stress level of the coral sand on its stress-strain, volume deformation characteristics and strength characteristics are analyzed. The analysis results show that the specimens with different relative densities all have the dilatancy characteristics, while for the specimens with same initial density, the larger the confining pressure, the less obvious the dilatancy. The initial tangential modulus of the coral sand increases with the increase of the confining pressure and relative density, which can be approximately expressed by a straight line. The relationships between the initial tangent modulus, relative density and confining pressure are established in this paper. The strain at the phase transition point increases with the increase of the confining pressure and decreases with the increase of the relative density. The strength indexes of the coral sand increase linearly with the increase of the relative density, and the relationships between them are established.