A method for giving an alarm on a positioning fault of an autonomous moving device. The autonomous moving device is configured to autonomously move, according to the positioning on the autonomous moving device, in a working region defined by a map. The method comprises: receiving positioning data from a satellite positioning system, so as to position an autonomous moving device; checking whether a positioning fault occurs on the autonomous moving device; and in response to the detected positioning fault occurring on the autonomous moving device, giving an alarm on the positioning fault.