Abstract: To study the ultimate bending bearing capacity and joint deformation ability of Wenzhou Rail Transit Line M1 shield tunnel lining, based on the opening failure test of the deformed lining segment joint of the shield tunnel, the research contents of metro lining structure joint failure test are introduced, including loading device, load design, test content and part of the test results. Numerical simulation analysis of the test is carried out. The results show that the development of joint mechanical behavior under positive and negative bending moments can be roughly divided into three stages: linear growth stage, plastic development stage and ultimate failure stage. The failure modes of ultimate failure state under positive and negative bending moments are different.