Provided is a motion monitoring method for monitoring a user's motion state with a motion monitoring device, sending an alert signal from the motion monitoring device to remind the user and displaying user data for recognizing the user when the motion monitoring device detects that the user's motion state does not generate any variation within a predetermined period of time or a generated variation is less than a standard value, and sending a distress signal from the motion monitoring device to specific and/or nonspecific persons if the alert signal is not turned off after the motion monitoring device having sent the alert signal continuously for a while, so as to lend a helping hand to the user as soon as possible.