Sun structure have research for hundreds years, which were very important for cosmic physics and earth science. This paper build 121 balls mathematic physics model, by Newton attract force equation. This model deduced out that solar internal parts got outward attract force. The internal particles might be accelerated to high speed to form light emission and jets. The surface parts got inward attract force, to show cool atmosphere. This model may deduce out and explain the sun light emission, flare, prominence, jets, and cool atmosphere phenomena. The 121 balls model can help research for solar physics, cosmic physics and earth science.