A system for staring an automatic car in safety and a method thereof, comprises: an engine speed detecting unit; a foot brake input detecting unit; a gear position detecting unit detecting whether a gear shift lever is in the neutral (N) position; a vehicle speed sensing unit parallel with the foot brake input detecting unit; a control unit making the engine not started when the foot brake is not operative and the gear shift velvet is not in the neutral position; a starting device starting the engine under the control of the control unit; and vacuum apparatus under the control of the control unit for sucking air in a Hydro-vac and turning the Hydro-vac into a vacuum state.