Hydrogen physisorption in Li-doped single-walled boron nitride nanotube array (SWBNNTA) is investigated in detail with grand canonical Monte Carlo simulations.It indicates that Li-doping is an effective mean to increase hydrogen storage capacity of SWBNNTA.The best doping scheme is studied.It shows that hydrogen storage capacity of Li-doped SWBNNTA at normal temperature and moderate pressure can exceed 2015 object of the U.S.Department of Energy.