Abstract: The cross section deformation of the superalloy ring with complex cross section (W) is very complicated during the multi-pass roll forming process. And the service performance of the ring is determined by the forming quality of its cross section. A three-dimensional elastoplastic finite element model of "W" ring in multi-pass rolling forming is established based on the ABAQUS/Explicit platform, and its reliability is verified by experiments. And then the proposed model is used to analyze the characteristics of the cross section deformation during the multi-pass rolling process. The results show that in the maximum stress zone of the ring, there is the minimum difference between theoretical and practical profiles in the ring section along the width direction of the outer. The minimum cross section deformation occurs in where the stress is largest. The deformation position of the minimum cross section remains unchanged with the increase of rolling pass. The results can provide guidance for prediction and control of the complex cross section deformation in the multi-pass rolling process of the superalloy ring with complex cross section.