Abstract: Some embodiments provide an auxiliary system for take-off, landing, and carrying of a multi-rotor unmanned aircraft on a mobile platform. One system includes a base and a sleeve rod. The base is fixed on the mobile platform. The sleeve rod is inserted into an opening of the base and fixed on the mobile platform. An airframe is provided with a circular hole at a center portion, through which the sleeve rod is configured to pass. The cone sleeve on the lower side has a circular opening at a top portion fixedly connected to the circular hole. The cone sleeve on the upper side has a circular opening at a top portion. A sleeve is provided downward along the circular opening.