Rectangular mortise and tenon joints are widely used in the furniture industry and wood timber engineering.In this study,the effects of tolerance,embedded length,and grain direction on the pull-out resistance of the rectangular mortise and tenon joint were investigated.The main findings were summarized as follows:1) The pull-out load vs.pull-out displacement curve of the rectangular mortise and tenon joint consisted of a linearly ascending part and a descending part.2) The pull-out load was improved by tightening the assembling tolerance within the range without the mortise and tenon joint causing damage during assembly.3) The pull-out load increased with the increase of the embedded length.However,the maximum pull-out load was found to be at 35 mm embedment length.4) The pull-out load along the grain direction was greater than that across the grain direction under the same conditions.