Construction industry has facing an extensive growth across the world for the past few decades. In a construction project, safety of the structures and that of the personnel is given much importance for the project to be successful. Construction site accidents are continuing, even though labour safety laws are available. This paper provides the solution for reducing the construction site accidents .It uses the sensors to detect the distance of the personnel from the safer limit. The PIR sensor detects the human, so that the worker crossing the safer limit will be detected and the buzzer produces the alarm to alert the worker. MEMS and parachute are used. Unfortunately when the worker falls from height, the MEMS get activated by angle variation of the worker and parachute expands.