Al(CON2H4)6Cl3　was　firstly　synthesized　as　a　precursorwith　urea　and　AlCl3•6H2O　as　a　nitrogen　source　and　an　aluminum　source,　respectively,　and　then　the　precursor　was　calcined　at　1000　to　prepare　spherical　h-AlN　nanoparticles.　The　effects　of　atmosphere　pressure　and　sintering　time　on　the　morphology　and　the　nucleation-growth　mechanism　of　AlN　were　investigated.　The　results　show　that　spherical　AlN　particles　with　the　sizes　of　320-460nm　are　formed　by　equiaxed　fine　grains　of　smaller　than　10nm　and　amorphous　phase　under　N2　pressure　of　0.1-0.2MPa.　As　the　N2　pressure　increases　to　0.5MPa,　the　diameter　of　spherical　AlN　increases　to　650nm,　and　rod-shaped　AlN　crystals　appear　in　the　aggregates.　The　size　and　number　of　rod　crystals　increase　as　the　sintering　time　increases.　AlN　nanoparticles　are　formed　by　the　reaction　of　AlCl3　and　NH3　due　to　the　decomposition　of　the　precursor.　The　gas　phase　saturation　in　the　crucible　increases　as　N2　pressure　increases,　promoting　the　nucleation　and　growth　of　AlN,　reducing　the　amorphous　phase　content,　and　enhancing　the　crystallinity　of　AlN.　©　2020,　Editorial　Department　of　Journal　of　the　Chinese　Ceramic　Society.　All　right　reserved.