For me this is the solution,Thanks,Whether you are defining a C++ structure or a blueprint structure, you need to check SaveGameFlag For MemberProperties that need to be saved. For the blueprint structure, click the button next to the MemberProperty of structure to expand the drop-down list. You can see the checkBox of SaveGameFlag. For the C++ structure, select the member properties that need to be saved. Just write SaveGame in UPROPERTY().