One ticket or separate? If one ticket and the same airline you should call them and ask if they transfer baggage. As of two years this was not offered and you you had to claim luggage, exit, and re-enter to the check-in area to re-check your luggage. Air China could not handle this then, but maybe now can. If separate airlines call the first and ask if they interline. The full service carriers generally do, and the LCCs basically never. And it is airport dependent.