To study the mechanical behavior of concrete filled steel tube columns subjected to compression-bending-torsion combined load, based on the general finite element program ABAQUS, the suitable material constitutive equations including concrete damage plastic model and steel perfect elastic-plastic model, boundary conditions and combined load conditions were chosen and applied, then the “shell-solid” refined model of concrete filled steel tube columns was established. A good agreement could be observed between the predicted results and test results, and both the stress-strain state of the steel and concrete and the global torsion moment versus rotation angle relations could be obtained, showing that the “shell-solid” refined model had high precisions, and the comprehensive results of concrete filled steel tubes subjected to torsion could be obtained.