Three-dimensional　(3D)　all-inorganic　cesiumlead　halide　perovskite　nanocrystals　(NCs)　have　showed　significant　potential　in　optoelectronic　applications　due　to　their　unparalleled　optical　properties,　but　it　still　remains　problems　in　applications,　especially　their　poor　stability.　Recently,　zero-dimensional　(0D)　all-inorganic　cesium　lead　halide　perovskite　NCs　have　been　attracted　much　attention　due　to　the　high　stability.　In　order　to　achieve　excellent　luminescent　performance　of　perovskite　NCs　with　high　stability,　it　has　been　proposed　a　nanostructure　of　Cs4PbBr6　NCs　with　embedded　CsPbBr3　(CsPbBr3@Cs4PbBr6).　In　this　paper,　we　developed　a　simple　one-pot　synthesis　method　for　CsPbBr3@Cs4PbBr6　NCs,　which　was　processed　in　octane　with　oil　bath　under　air　ambient　and　simplify　the　tedious　process　of　purification.　By　this　method,　it　was　obtained　nearly　uniform　(46　+/-　2　nm)　CsPbBr3@Cs4PbBr6NCs　with　high　photoluminescence　quantum　yield　(PLQY,　85.3%,　in　solution).　Moreover,　the　synthesized　CsPbBr3@Cs4PbBr6　NCs　powder　exhibited　remarkable　durability　with　hour-scale　photostability,　thermostability　at　80　degrees　C　and　long-term　storage　over　180　days　in　air.　This　simplified　synthesis　method　would　open　a　new　avenue　for　simply　enhancing　the　stability　of　perovskite　nanocrystals,　and　pave　a　huge　potential　path　for　mass　production　of　perovskite　nanocrystals.　(C)　2019　The　Authors.　Published　by　Elsevier　Ltd.