I changed the unit format parameter by hand, but the lookup has no change, I have no idea to change it use API. Because this unit and project unit is different, I can't change project unit. Does somebody know how to solve this problem
If storage type is none then it cant be set via parameters with API.
Perhaps try to see if what you want can be done via DimensionType.SetUnitsFormatOptions or the various other methods for units that exist on this class type.
