  In this paper, we investigate the evolution of primordial black hole (PBH) in
vacuum-dominated era within Brans-Dicke cosmology. We consider the accretion of
vacuum energy by PBHs and found that vacuum energy accretion efficiency should
be less than 0.61. We also study the evaporation of PBHs where we conclude that
larger the value of accretion efficiency longer live the PBHs. We also find
that PBHs evaporate at a quicker rate in Brans-Dicke theory compared with
Standard Cosmology.
