Abstract: A three dimensional finite element modal was established to analysis the welding residual stress of hybrid steel U-rib stiffened plate under different conditions. In this paper, a welding residual stress simulation method which was verified by large number of experiments, was used to identify the influence of thermal conductivity, specific heat capacity, density, modulus of elasticity, Poisson ratio and coefficient of thermal expansion to the distribution of the plate residual stress, respectively. The analysis results show that the coefficient of thermal expansion and Poission ratio have very little influence to the residual stress; the modulus of elasticity and thermal conductivity have most important influence; and the specific heat capacity and density have the moderate influence. As a result, the elastic modulus and thermal conductivity should be paid more attention in the welding residual stress numerical simulation on the hybrid steel U-rib stiffened plate in order to get the correct values.