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In this talk,I will summarize the recent research on the phase engineering of nanomaterials in my group.It includes the first-time synthesis of hexagonal-close packed(hcp)Au nanosheets(AuSSs)on graphene oxide,the first-time synthesis of 4H hexagonal phase Au nanoribbons(NRBs),the synthesis of crystal-phase heterostructured 4H/fcc Au nanorods,the epitaxial growth of metals with novel phases on the aforementioned Au nanostructures,and the synthesis of amorphous/crystalline hetero‐phase Pd nanosheets.