Urban　heat　island　intensity　(UHII)　is　an　important　metric　used　in　measuring　urban　heat　island　(UHI)　effect.　Nevertheless,　its　quantitative　measurement　has　not　been　clearly　addressed.　Due　to　the　limitation　of　meteorological　stations　either　in　their　number　or　in　their　location,　the　traditional　method　which　calculates　the　temperature　difference　between　urban　and　rural　areas　based　on　the　meteorological　station　data　can　not　accurately　describe　the　UHII　of　a　city.　Nowadays,　the　land　surface　temperature　(LST)　derived　from　satellite　thermal　infrared　data　has　been　widely　applied　in　UHI　study.　Therefore,　based　on　the　conceptual　framework　of　diurnal　temperature　range　(DTR),　this　paper　developed　an　urban　heat　island　intensity　index　(UHIIDTR),　and　applied　the　new　index　to　study　the　UHI　of　Fuzhou　City,　Fujian　Province,　China.　Various　values　of　LSTs　used　to　calculate　UHIIDTR,　such　as　maximum　LST,　minimum　LST　and　average　LST,　have　been　obtained　from　four　LST　profiles,　which　cross　the　city　center　in　four　directions.　The　results　show　that　the　UHIIDTR　can　reveal　the　multi-temporal　UHII　change　objectively.　During　the　study　period　from　1989　to　2013,　the　UHIIDTR　of　Fuzhou　decreased　gradually　from　5.22　in　1989　to　3.01　in　2013,　indicating　an　intensification　of　the　city＇s　UHI　effect.　This　UHIIDTR-based　result　is　consistent　with　many　previous　study　results　regarding　the　city＇s　UHI.　Furthermore,　the　trend　analysis　of　the　city＇s　UHIIDTR　data　has　suggested　a　continuous　strengthening　of　the　urban　heat　island　phenomenon　in　Fuzhou　city.　©　2017,　The　Editorial　Board　of　Journal　of　Basic　Science　and　Engineering.　All　right　reserved.