Fun in learning is an important issue in early childhood education. It not only gives children a lot of imagination, but also motivates their creativity and active thinking in the process. Most parents want their kids to learn in easy ways and also expect them to generate their interest while learning. Therefore, fun in learning plays a significant role and has a deep-rooted impact on growing children. In this paper, we design an interactive percussion combined with Lego robots and tablet. First, children edit the rhythm of music with tablet. When the editing is completed, the robots will play the percussion according to the previous editing. In addition to free-arranger above, it can also doing rhythm editing with increasing level coordinate with the correspondent background music. Besides, you can record your work without spending great time on re-editing and can immediately make changes to your savings. Finally, our system will do the rating based on the children’s editing. It can determine the quality of the music in rhythm. As a result, interact with the robotic percussion music can enhance children’s interest in music rhythm and stimulate kids spontaneously re-use. With listening the rhythm stroke by robot, understanding the fitness of each instrument and modify, children have learned unconsciously musical rhythm and music creation.