Ammonia　is　considered　as　a　promising　hydrogen　carrier,　which　is　seen　as　a　reliable　carbon-free　fuel.　Improving　the　combustion　properties　of　ammonia　is　the　focus　of　current　research.　The　hydrogen　could　be　dissociated　from　the　ammonia　in　real　applications.　For　purpose　of　combustion,　partially　dissociated　ammonia　could　be　combusted　directly　without　using　extra　hydrogen.　Laminar　burning　velocity　is　an　important　combustion　parameter,　but　there　are　only　a　few　data　of　partially　dissociated　ammonia　are　reported.　To　fill　the　data　gap,　the　laminar　burning　velocity　was　measured　at　various　equivalence　ratios　and　dissociation　degrees　of　ammonia　by　the　constant　pressure　spherical　flame　method　in　this　study.　Besides,　fifteen　kinetic　models　were　compared　with　experimental　data,　and　the　model　with　the　best　consistency　was　obtained.　The　experimental　results　show　that　the　laminar　burning　velocity　increases　monotonically　with　the　increase　of　the　dissociating　degree.　When　ammonia　is　completely　dissociated,　the　maximum　laminar　burning　velocity　increases　from　7.9　cm/s　to　228　cm/s,　and　the　equivalence　ratio　corresponding　to　the　peak　value　also　shifts　from　1.1　to　1.6.　The　laminar　burning　velocity　predicted　by　the　model　constructed　by　Stagni　is　in　best　agreement　with　the　experimental　data.　Moreover,　data　calculated　by　the　five　correlations　for　predicting　laminar　burning　velocity　were　compared　with　the　numerical　data　to　verify　that　whether　they　are　suitable　for　the　mixtures　with　additional　nitrogen.　The　results　show　that　the　correlation　based　on　the　activation　tem-　perature　is　the　most　accurate.　However,　it　still　has　a　maximum　relative　error　of　+/-　20%　within　the　calculated　range.　(c)　2021　Published　by　Elsevier　Ltd　on　behalf　of　Hydrogen　Energy　Publications　LLC.