A vibration system which does not rely on adhesive assembly includes a first bracket and a vibration assembly. The vibration assembly includes a voice coil portion and a first diaphragm portion. The voice coil portion includes a mounting base and a voice coil body. The voice coil body surrounds an outer surface of the mounting base. Through holes define in one end of the mounting base. The through holes penetrate the base. The first diaphragm portion includes two connecting portions and a diaphragm body between the two connecting portions. A first connecting portion connects the first bracket. A second connecting portion surrounds an end of the mounting base away from the voice coil body, and the second connecting portion inserts into the through hole. The disclosure further provides a loudspeaker and a method for manufacturing the vibration system.