Safety for the old is a matter of considerable interest. It is a design of intelligent walking stick system which can realize automatic alarm based on Internet of things. Data sampling and data processing are included in the walking stick terminal. The system takes good use of which ADXL345 acceleration sensor has the advantage in measuring angles with high precision and SIM908 integrates GPS and GSM to get accurate condition of the old, then decide and take actions. It overcomes the shortage that related domestic products currently can only ask for help manually. Experiment proofs the system can get positions, detect falling down,communication and alarm automatically. It is a method to providing security for the elderly.