The application discloses a dual-mode bladeless obturator and trocar with two halves. The bladeless obturator comprises a proximal handle and a distal-end portion and a shaft therebetween, the shaft including a central axis, said distal-end portion including a stationary-half and a movable-half； the stationary-half extends from the distal end to the proximal end and is fastened to the shaft or handle, and the movable-half is movable relative to the stationary-half along the central axis direction； the stationary-half comprises a stationary base and a stationary distal-end connected thereto； the movable-half comprises a movable base and a movable distal-end connected thereto and extending to the movable slant distal-end； the stationary-half includes a sharp separating-edge and/or a sharp top-end, the movable-half includes a blunt separating-edge and a blunt top-end.
