To optimize graded lattice structures with spatially graded geometrical characteristics and promote the rational distribution of finite materials in macrostructure， a two-scale concurrent topology optimization method combining dynamic clustering is proposed. Dynamic clustering strategy is developed to group microstructures， which means that the clustering pattern will be updated according to the current strain energy during the whole iterations and obtains a more reasonable microstructures’ distribution than the static partition. Further， rotational degree of freedom is introduced to make sure that the microstructures are oriented along principal stress directions， so as to obtain a more reasonable load transfer path. Numerical examples show that， compared with the traditional static partition method， this method can more effectively distribute materials， make full use of the anisotropic of lattice structures， and improve structural performance.