A notebook computer includes a housing, a CPU, a memory, a display, a storage device, a detachable battery pack and a keyboard module. The notebook computer is characterized in that the housing includes a predefined space and a connection interface disposed in the predefined space. The connection interface is electrically connected to the CPU. The notebook computer includes a plurality of electronic device modules. Each electronic device module includes a casing portion and a main body portion, and the main body portion includes a transmission interface. The size of each electronic device module may correspond to the size of the predefined space. Each electronic device module may be secured in the predefined space for combination with the housing, and the transmission interface is electrically connected to the connection interface for power or data transmission. The plurality of electronic device modules are capable of combining individually with the housing for replacing different functions.