The soft tissue model with high modeling speed and accuracy can improve the realism in a virtual surgery simulation system. In this paper, we propose a new virtual soft tissue torsion model based on membrane analogy and Kriging interpolation. The model adopts the membrane analogy method to compute the deformation of all the key sample points on the ridges, and uses the Kriging interpolation method to compute the deformation of any points among the ridges. An experiment simulation system was built on the haptic interaction device of PHANTOM OMNI, and the deformation simulation of virtual small intestine under the action of the applied torsion was realized. The experiment results show that the proposed model has such advantages as fast operation speed, high calculation accuracy, realistic deformation and accurate, reliable haptic feedback.