Abstract: Booi was the integral part of the Qing banners society and the subordinates of the imperial clan． Owing to the double status of booi and its special relations to the imperial family and the Imperial Household，the research on booi is the important part of the Qing politics and banners society． However，the interpretation to the booi has not been clear now． After reviewing the past arguments，this article distinguishes the different names of booi，aha，booi aha and household servant，and identifies the booi as the special name to the numbers of the organization of booi． The use of booi should not be interchanged with aha，booi aha and household servant．