Hi
At the moment importing Altium import are using comment field to map device .
This is not correct .Same applies to footprints .
I think you should use selection of which Altium parameters responds to what field in EasyEda schematic
or check component parameters of same name in Altium sch and map them directly to EasyEda components.
Brand new interactions and interfaces. 
Easy to use and quick to get started. 
comment field is the mostly useful property, the other field is not good, altium doesn't have the unique and cleary property to do this