1. A method of fast switching control for different operation systems pre-installed in a computer with a hard disk, a system memory, a basic input output system and an event signal generation unit, the hard disk at least stored with a first operation system, a second operation system and a second operation system kernel program, the method comprising the following steps: (a) completing a basic system booting process of the computer; (b) loading and executing the first operation system in the hard disk; (c) establishing a second operating system kernel diagram memory region in the system memory; (d) loading the second operation system kernel program from the hard disk into the second operating system kernel diagram memory region; (e) detecting whether the event signal generation unit generates a preset first event signal; (f) executing the second operation system kernel program preloaded in the second operation system kernel program memory region when the first event signal is detected; and (g) switching the computer from executing the first operation system to executing the second operation system.