In order to investigate the effect of the nail diameter and loading direction to the grain on the failure mode， load carrying capacity， hysteresis characteristics， stiffness degradation， and energy consumption capacity of the specimens， 50 laminated bamboo lumber （LBL） nailed connections were tested under monotonic and cyclic loadings. It is found that the failure phenomenon of the nailed connections varies greatly between different loading methods. For the specimens loaded monotonically， two plastic hinges within the nail and fiber crushing beneath the nail shank were observed. However， most nails failed in low cycle fatigue fracture due to reversed bending in the reversed cyclic loading tests， which is seldom investigated during the shaking table tests and earthquake excitation. The nail diameter is the major factor that affects the mechanical performance of the nailed connections. The load carrying capacity and the stiffness of the specimens increase significantly with the increase of the nail diameter， while the effect of the loading direction to grain is small. The load carrying capacity and stiffness of the specimens under monotonic loading are higher than those subjected to reversed cyclic loading. The load-displacement hysteresis curves of the specimens are not in plump shapes and have significant pinch phenomena at the initial loading stage. The cumulative dissipated energy of the nailed connections increases with the increasing nail diameter and decreases with the increase of the loading direction to the grain. These findings obtained can offer a theoretical reference for the design of the LBL nailed connections， and speed up its applications in the field of civil engineering.