The 12×12 nonlinear stiffness matrix is obtained based on the rod theory considering the geometric nonlinearity and the effect of water dynamic and the finite element can be called by general finite element software.

Based on the slender rod theory,the stiffness matrix and mass matrix of polyester cable element in the deep seas are derived.

In this paper, the concept of added mass and additional apparent area are applied, the method of normal force engineering calculation based on slender body theory of missile body having non-circular shape cross sections (rectangle, square, triangle etc) is presented.

This paper reviews the mathematical problems in the numerical method of the slender body theory and points out a questionable formula used in the other papers.

Based on the slender body theory and combining with the model tests of a Mariner Ship,added masses and viscous derivatives were calculated and compared with that results from captive model test respectively.

Based on Noblesse\'s New Slender Ship Theory and Michell Thin Ship Theory,this paper cal-culates the wave-making resistance of Wigley form in the Froude number between 0.

A numerical method based on the slender-body theory is applied to calculate the linear hydrodynamic derivatives of KSC ship,a benchmark ship for the international comparative research on ship manoeuvrability,in manoeuvring motion at a finite speed in shallow water.