H-alpha　(Balmer-alpha),　H-beta　(Balmer-beta)　and　H-gamma　(Balmer-gamma)　spectral　line　intensities　in　atomic　hydrogen　plasma　are　investigated　by　using　a　high-power　RF　source.　The　intensities　of　the　H-alpha,　H-beta　and　H-gamma　spectral　lines　are　detected　by　increasing　the　input　power　(0-6　kW)　of　ICPs　(inductively　coupled　plasmas).　With　the　increase　of　net　input　power,　the　intensity　of　H-alpha　improves　rapidly　(0-2　kW),　and　then　reaches　its　dynamic　equilibrium;　the　intensities　of　H-beta　can　be　divided　into　three　processes:　obvious　increase　(0-2　kW),　rapid　increase　(2-4　kW),　almost　constant　(4-6　kW);　while　the　intensities　of　H-gamma　increase　very　slowly.　The　energy　levels　of　the　excited　hydrogen　atoms　and　the　splitting　energy　levels　produced　by　an　obvious　Stark　effect　play　an　important　role　in　the　results.