Presents　the　results　of　numerical　simulation　on　turbulent　flow　in　a　circular-section　90-degree　bend　by　means　of　large　eddy　simulation　(LES).　The　Taylor-Galerkin　finite　element　method　is　used　in　the　simulation.　The　results　of　calculation　coincide　with　experiments　reasonably.　It　demonstrates　that　LES　technique　is　especially　available　for　flow　situations　with　complicated　geometrical　boundary　system　in　which　there　are　always　anisotropic　large　vortexes.