A multi-buttons booting system comprises an on-switch button logic unit, an embedded chip (EC) and its RAM, a lookup module, and a loading module. A plurality of on-switch buttons are connected to the EC and corresponds to a plurality of operating systems. In response to the push on a button, the EC outputs a signal that writes an indicator value in the RAM. According to the indicator value, the corresponding MBR is sought and loaded. The loaded MBR then conducts the booting of a corresponding operating system. The system resource occupation is thereby reduced, the activation speed is increased, and the user's manual intervention is reduced.