Abstract: Alzheimer's disease is a common disease and is harmful to the elderly． At present，there is no effective cure for Alzheimer's disease． It can only reduce the harm of Alzheimer's disease to the patient，family and society through nursing． Alzheimer's disease is a chronic disease and the nursing cycle is long，so it often causes great physical and mental stress to the nursing staff． In order to reduce the patient's pain and relieve the burden of the caregivers，an intelligent wearable device based on signal acquisition and wireless communication is developed． On the one hand，it can monitor the patient's behavior in real time． The patient's foot pressure changes are collected by PVDF ( Polyvinylidene Fluoride) sensors，then the behavior is notified and the caregiver is notified to ensure patient safety． On the other hand，we can locate the patient's position information by GPS( Global Positioning System) and notify the caretakers in real time by SMS ( Short Message Service) ，and the device has the function of emergency notification． This smart wearable device adapting to Alzheimer＇s patients can help the caregivers take care of the patients and ensure the safety of the elderly．

Key words: intelligence, care, wearable, polyvinylidene fluoride ( PVDF) sensor, global positioning system( GPS) , global system for mobile ( GSM)