In　this　paper,　a　rotary　engine　equipped　with　an　n-butanol　and　hydrogen　port　-injection　system　was　developed　to　investigate　the　cOmbustion　and　emissions　characteristics　of　a　hydrogen　-blended　n-butanol　rotary　engine　at　part　load　and　stoichiometric　conditions.　A　self　-developed　hybrid　electronic　control　unit　was　adopted　to　adjust　the　injection　durations　of　n-butanol　and　hydrogen.　The　rotary　engine　was　run　under　the　conditions　of　4000　rpm,　a　manifold　absolute　pressure　of　35　kPa　and　a　fixed　spark　timing　of　45　degrees　CA　before　the　top　dead　center　during　the　whole　testing　operation.　The　hydrogen　volumetric　fraction　in　the　total　intake　was　variedfrom　0%　to　6.30%.　The　test　results　manifested　that　the　brake　thermal　efficiency　and　chamber　temperature　were　simultaneously　increased　with　hydrogen　addition.　The　hydrogen　supplement　obviously　shortened　flame　development　and　propagation　periods.　Both　chamber　pressure　integral　heat　release　fraction　versus　crank　angle　were　increased　when　the　hydrogen　fraction　was　enhanced.　HC　emissions　were　reduced　by　54.5%　when　hydrogen　volume　fraction　was　raised　from　0%　to　6.30%,　CO　and　CO2　emissions　were　also　reduced　after　increasing　hydrogen　blending　fraction.　NOx　emissions　were　mildly　elevated　due　to　the　improved　chamber　temperature.　(C)　2017　Hydrogen　Energy　Publications　LLC.　Published　by　Elsevier　Ltd.　All　rights　reserved.