Mortise and tenon connection of rough wood furniture should be non-traditional precision engagement because the forms and structures of rough wood furniture are lively and mildly. Three kinds of forms of mortise and tenon joint cooperation were given, four types of basic forms of connecting square section to circular section with method of mortise and tenon and two sorts of connection forms between double circular sections were summed up. The ifndings can be used to guild the structure design of mortise and tenon connection in rough wood furniture and provide the technical support for designin...