Abstract: High-quality structured mesh is essential in finite element analysis.Limited by special requirement of node distribution in the structured mesh,current structured mesh generation methods are hard to be directly applied to geometries with complex boundary.To solve this problem,a new structured mesh generation method is proposed.For polygon area with complex boundary,the shape of boundary is simplified to be regular in computational space based on vertex classification,the simplified polygon area is splitted and filled with structured mesh,and then the structured mesh is mapped back to original area;for triangular and circular areas with special boundary,splitting lines are calculated based on the boundary node distribution to split original area into simple quadrilateral areas,each quadrilateral area is filled with structured mesh;for transition between neighbored meshing areas,different boundaries are linked and direction of boundary edges are set,the polygons with close direction boundary edges are identified through the transformation of the corresponding matrix of boundary edges,each identified polygon is filled with structured mesh to form an effective transition between different meshing areas.Examples verify the efficiency of the proposed method.