Hα　(Balmer-alpha),　Hβ　(Balmer-beta)　and　Hγ　(Balmer-gamma)　spectral　line　intensities　in　atomic　hydrogen　plasma　are　investigated　by　using　a　high-power　RF　source.　The　intensities　of　the　Hα,　Hβ　and　Hγ　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　α　improves　rapidly　(0-2　kW),　and　then　reaches　its　dynamic　equilibrium;　the　intensities　of　Hβ　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　Hγ　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.