Fall is one of the main factors affecting the physical and mental health of the elderly,and therefore,research on the devices which are able to effectively defect the fall and protect the elderly from it is particularly important.Fall detection and protection devices mainly include three modules:detection module,control module and protection module.This paper summarizes the existing wearable fall detection and protection technology.We analyze their function and technology and the main algorithms used in the system,compare several wearable fall detection and protection systems,and summarize the advantages and disadvantages of the existing systems,finally outlook the development trend of wearable fall detection and protection systems.We believe that wearable fall detection and protection devices have a broad development space and market prospects.