Laminated bamboo lumber is a bamboo material that flat laminates are glued by adhesives and co MPacted into mould. Side-pressure laminated bamboo lumber has a good mechanical property. In order to explore its mechanical properties under axial compression, an experimental study was carried out in 6 groups of 18 specimens with different slenderness ratio. The relationships between various parameters (bearing capacity, strain, lateral displacement and axial displacement) and slenderness ratio were analyzed, and the failure modes of specimens under different slenderness ratios were discussed.The results indicate the mechanical process of side-pressure laminated bamboo lumber has experienced the stages of elasticity, elastic-plastic and failure. With the increase of slenderness ratio, the failure mode changes from material strength failure to buckling failure, and the material strength failure has obvious ductility property. The comparison between experimental results and various specifications was made to put forward the formula of bearing capacity under axial compression of side-pressure laminated bamboo lumber, and the calculated values agree well with the experimental values.