Abstract: This study employed the bloomed bamboo veneer bundle of Neosinocalamus affinis to produce different density of laminated bamboo-bundle veneer lumber(BLVL). The effect of soaking temperature and target density on moisture absorption behavior had been studied by Fick's law. The results showed that the diffusion modelof Fick's law provided a good prediction for long term hygroscopic behavior of BLVL. While some prediction errors existed at higher temperature(≥63 ℃), temperature had a significant effect on moisture absorption behavior, and the equilibrium ratio of weight gain and thickness swelling were enlarged with soaking temperature, rise and the moisture sorption rate was accelerated; The density of BLVL had certain effect on its moisture absorption behavior that the panel performed low hygroscopic expansion deformation and better dimensional stability with higher density.