A universal fall detect system and its unique designed sensor as well as methodology to detect the fall event are disclosed. The fall event is detected by measuring relative position, and/or orientation between host body and direction of gravity at the spot where falling event happens. The system can present either as a standalone system or a built-in component with supporting software installed on other devices. The system linked to wide network and wide audience can trigger several emergency response and assistances if needed in time when a falling event happens.