In　high-power　RF　ion　source,　three　different　regions　of　the　H-beta　and　H-gamma　intensities　in　the　Balmer　series　of　spectral　lines　for　atomic　hydrogen　plasma　were　investigated.　Three　different　regions　of　the　H-beta　and　H-gamma　intensities　were　detected　by　the　increase　of　input　power　(0-6　kW)　at　ICP.　In　hydrogen　plasma　spectrum,　the　H-beta　and　H-gamma　intensities　showed　three　processes:　slowly　increase,　quickly　increase　and　stable　saturation.　The　Stark　effect　in　strong　electrical　field　plays　a　crucial　role　in　dominating　the　Balmer　H-beta　and　H-gamma　emissions　from　high-density　RF　plasma.