  The Labastida-Marin\~o-Ooguri-Vafa (LMOV) invariants are the open string BPS
invariants which are expected to be integers based on the string duality
conjecture from M-theory. Several explicit formulae of LMOV invariants for
framed unknot have been obtained in the literature. In this paper, we present a
unified method to deal with the integrality of such explicit formulae.
Furthermore, we also prove the integrality of certain LMOV invariants for
framed unknot in higher genera.
