As a new type of structure in port and waterway engineering,large cylinder structure is limited understood in the field due to the complicated mechanism.In order to study the factors which affect the overall stability and horizontal displacement of the large cylinder structure,a 3D numerical model is established based on PLAXIS 3D software which is used to simulate the overall stability and horizontal displacement of the large cylinder structure under the conditions of the different density, strength and stiffness of foundation soil,the different density,strength of filling soil,and the different embedded depth of large cylinder structure.The results show that the overall stability of large cylinder structure increases with the increase of foundation soil density,friction angle and embedded depth, decreases with the increase of filling soil density,and is independent of the filling soil friction angle and the foundation soil elastic modulus.The horizontal displacement of large cylinder structure decreases with the increase of soil density,friction angle,elastic modulus and embedded depth,increases with the increase of filling soil density,and is independent of friction angle of filling soil.The results can provide basis for the design of large cylinder structure.