Abstract：Partitioned solution procedures could be effectively used to solve Biot¢s equations，which can depict the coupled soil-pore fluid systems. With this method，the existing finite element analysis software could be utilized adequately，while the problem of ill-conditioned matrix，emerging in monolithical approach when the coefficient of permeability of the soil is comparatively small，can be settled successful. The partitioned approaches of Biot¢s equations are all based on the discrete form by finite element method，which will lead to the difficulties when employing them in the redevelopment of existing programs. After comparing the transient heat conduction equation and the pore pressure dissipation equation，a new multi-iteration serial partitioned solution procedure is proposed，in which a certain predicted known value is substituted for the coupled unknown item in pore pressure dissipation equation. With the only one unknown parameter，the nodal pore pressure is left in the equation and could be figured out easily. Subsequently，the solution from the above step is incorporated into the second equation and the other variable，the nodal displacement could be calculated separately. And then，all the load steps could be solved in uncoupled form iteration. With little additional procedures，this method could be easily realized in thermo-structural analysis programme(or independent). This differential equation based method，suitable for two or three-dimensional problems and for static or dynamic problems as well as various element types，is proposed. As demonstrated with numerical examples，this approach could give comparatively precise results and has good computational stability. Subsequently，this approach was applied to the transverse dynamic response analysis of Wuhan Yangtze River Tunnel.
