This paper proposes an approach to automatic motion generation of 3D spring model with music. Music factors are extracted from MIDI (Music Instrument Digital Interface) file. Instead of designing and calculating animation of an object directly, a sequence of motion-controllers, which can finish a set of motions affected by music factors, are automatically generated through a synthesis algorithm. A prototype system is developed to evaluate the motion generator and it is confirmed that the users are satisfied with the generated motion based on music.