A method for express execution of multimedia playing for a computer multimedia system to load kernel operating system from a high speed data storage is provided. The computer of the computer multimedia system has a central processing unit, a data storage, a system memory, a BIOS, a plurality of hot keys, and a plurality of multimedia devices, and a high speed data storage connected to the central processing unit through a bus. When a hot key is detected to be operated, the computer loads and executes the second operating system and kernel to system memory, and loads and executes the multimedia device driver and multimedia device application program for the multimedia device associated with the pressed hot key. The high speed data storage is a memory chip or a flash memory.