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, and wherein the event signal generation unit is a user operated element for generating event signals for switching between the first and second operation systems, 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 without starting execution of the second operation system and without stopping execution of the first operating system; (e) detecting whether the event signal generation unit generates a preset first event signal by operation of the user; (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.