1， cognitive ability: correctly guide the child to the color， scale of cognition， expand the baby's knowledge， to ensure the smooth of the late stage of the game.2， music perception: baby through changes in the speed of Guoqin knock a sound level， rhythm， melody to feel the music， and gradually improve the discrimination of subtle changes in music.3， auditory training: different color of the piano piece or force size， may issue a different sound， in order to stimulate the baby's auditory development.4， exercise ability: both single hand or hands tapping the keyboard， need wrist force and arms to control direction， this game can effectively exercise the hands of coordination.