GaN　single　crystals　were　grown　in　Na-Li-Ca　flux　system　of　which　Li-Ca　gradually　replaces　Na.　X-ray　powder　diffraction　analysis　confirmed　that　the　structure　of　GaN　samples　was　wurtzite.　As　concentration　of　Li-Ca　in　flux　increased,　the　shape　of　GaN　crystals　was　changed　from　pyramidal,　prism　to　platelets　in　sequence,　and　the　color　of　them　became　transparent　gradually.　Among　of　them,　the　transparent　prism　crystals　were　grown　first　at　700　degrees　C　when　the　concentration　of　Li-Ca　was　31.6　mol%　and　48.9　mol%　in　flux　solution,　respectively.　Raman　spectra　implied　that　these　crystals　were　stress-free　and　the　transparent　crystal　grown　in　the　high　concentration　of　Li-Ca　solution　had　high　structural　quality　or　low　impurity　concentrations.　(C)　2018　Author(s).