Abstract: The present invention provides a smart phone system, which includes a memory for storing operating systems. The memory includes: a boot zone for storing a boot load program for initialization and loading a selected bootloader into a RAM when a system hardware is powered up; bootloader zones of at least two operating systems for respectively store the bootloader of the first operating system and the second operating system; binary code zones of the at least two operating systems for respectively store binary codes of the first operating system and the second operating system. An arbitrary operating system can be selected to boot among various operating system when booting the smart phone system. Therefore, adaptability and extendibility of the smart phone can be increased without the costs of adding a hardware.