Abstract: A stepless extendable rod comprises: an inner tube, an outer tube fit over said inner tube, a fixture securing said outer tube to said inner tube; said fixture is disposed to a proximal end of said inner tube; said fixture includes a mortise and a tenon, said tenon rotatably inserts inside said mortise to enlarge a wall of said mortise. Said tenon inserted inside said mortise to enlarge a wall of said mortise, the wall is extruded and fixed to an inner wall of said outer tube. Said inner tube is movably secured to said outer tube. Said extendable rod is designed with a simple structure, which is easy to assemble, saving space and transportation cost.