Assembly gap of dynamic seal in wet clutch is an important assembly requirement in vehicle transmission system,which directly affects the performance and safety of vehicles.In order to guarantee that the assembly gap satisfies design requirement in working condition,an analysis method for assembly gap in wet clutch considering actual working conditions was proposed based on finite element analysis and Jacobian-torsor.Targeting at the assembly gap in a kind of wet clutch,distribution interval of the minimum assembly gap was calculated at rotating state,and the contribution of each deformation was calculated quantitatively.The results show that the distribution interval of the minimum assembly gap is[-0.022,0.098] mm,which is inconsistent with the design requirement[0.025,0.207] mm;to control the deformation with contribution up to 74.22% caused by interference fit of flow-distributing sleeve inner hole,a fine machining process of the inner hole is added after assembly is applied;the distribution interval of the minimum assembly gap increases to[0.027,0.139] mm,which satisfies the design requirement and guarantees the operation performance of vehicles.