The invention discloses an auto-dialing distress method used after user falling detected by a smart phone. The auto-dialing distress method includes the steps that 1, the smart phone samples the accelerations and calculates a resultant acceleration a; 2, the resultant acceleration a is judged whether or not to be larger than an acceleration threshold value T1, if so, go to the step 3; if not, back to the step 1; 3, three axis attitude angles of the smart phone are calculated, and two of the three-axis attitude angles are judged whether or not to be larger than an angle threshold value T2, if so, go to the step 4; if not; back to the step 1; 4, the smart phone prompts an alarm, and a timer starts, if the alarm is manually released within 10s, back to the step 1; or not, go to the step 5; 5, a preset number is automatically dialed, and a short message showing the position of the smart phone is sent.