Abstract: Based on finite volume community ocean model (FVCOM), this paper simulated Lagrange residual current, finite-time Lyapunov exponents (FTLEs) and Lagrangian coherent structures (LCSs) in Jiaozhou bay.The results show that the main vortices in the west and east of Jiaozhou bay are all anticlockwise, and three vortices, clockwise, anticlockwise and clockwise respectively, spread from north to south in the middle.There are also some small residual vortices in Dagu River estuary, Yanghe River estuary and so on.Corresponding to the residual current structures, the obvious ridges of LCSs in north-south direction exist in Jiaozhou bay.The ridges of LCSs characterize the boundary of the residual vortices and play a barrier role in material transport from one side to the other.This paper clarifies the distribution characteristics of pollutant transport in Jiaozhou bay from the aspect of Lagrangian method.The research results can explain the high concentration phenomenon of pollutant, optimize the site selection of sewage outlets and provide reference for marine environmental management in Jiaozhou bay.