A distance measurement and alarm method, comprising: sending pairing request information for establishing a connection with a receiving terminal (step 110, step 210); after the receiving terminal is paired with, calculating a current distance to the receiving terminal (step 120, step 250); and comparing the current distance with a preset distance threshold (step 130, step 260), and if the current distance exceeds the distance threshold, displaying distance prompt information (step 140, step 270), wherein after the sending pairing request information for establishing a connection with a receiving terminal, the method further comprises: receiving response information sent by the receiving terminal, wherein the response information is information that the receiving terminal is successfully paired with (step 220); selecting a channel model equation according to a comparison between a theoretical distance and an input original distance (step 230); calculating the current distance to the receiving terminal by using the channel model equation (step 250); wherein the theoretical distance is a distance when signal strength is uniform and no building blockage is present to the receiving terminal; and the original distance is a distance when signal strength is not uniform due to blockages such as buildings and impurities to the receiving terminal. sending pairing request information for establishing a connection with a receiving terminal (step 110, step 210); after the receiving terminal is paired with, calculating a current distance to the receiving terminal (step 120, step 250); and comparing the current distance with a preset distance threshold (step 130, step 260), and if the current distance exceeds the distance threshold, displaying distance prompt information (step 140, step 270), wherein after the sending pairing request information for establishing a connection with a receiving terminal, the method further comprises: receiving response information sent by the receiving terminal, wherein the response information is information that the receiving terminal is successfully paired with (step 220); selecting a channel model equation according to a comparison between a theoretical distance and an input original distance (step 230); calculating the current distance to the receiving terminal by using the channel model equation (step 250); wherein the theoretical distance is a distance when signal strength is uniform and no building blockage is present to the receiving terminal; and the original distance is a distance when signal strength is not uniform due to blockages such as buildings and impurities to the receiving terminal. receiving response information sent by the receiving terminal, wherein the response information is information that the receiving terminal is successfully paired with (step 220); selecting a channel model equation according to a comparison between a theoretical distance and an input original distance (step 230); calculating the current distance to the receiving terminal by using the channel model equation (step 250); wherein the theoretical distance is a distance when signal strength is uniform and no building blockage is present to the receiving terminal; and the original distance is a distance when signal strength is not uniform due to blockages such as buildings and impurities to the receiving terminal.