In　the　view　of　scarce　of　natural　mineral　resources　and　requirement　of　energy-saving/emission-reducing　for　cement　industry,　the　natural　silicon-aluminum　clay　as　one　cement　raw　material　has　been　gradually　replaced　by　silica-rich　industrial　wastes,　such　as,　fly　ash,　a　principal　solid　waste　discharged　from　coal-fired　power　plants,　composed　mainly　of　silica-　and　alumina-rich　glass　bead-shaped　mineral.　Using　fly　ash　to　produce　cement　raw　materials,　the　formation　and　chemical　reactions　of　cement　clinker　are　affected　by　the　chemical　and　mineral　composition　as　well　as　the　texture　of　the　fly　ash　and　the　paper　was　focused　on　it.　The　empirical　formula　for　formation　heat　of　fly　ash-doped　cement　clinker　is　revised　on　the　basis　of　chemical　thermodynamics.　The　results　show　that　with　the　use　of　fly　ash,　in　contrast　with　the　traditional　ingredients,　the　formation　of　varieties　of　clinker　minerals　as　well　as　the　formation　sequence　and　types　of　intermediates　varied　little,　while　the　maximum　decomposition　temperature　of　carbonate　was　lowered　by　50°C　approximately,　so　that　both　the　solid　phase　reaction　temperature　and　liquid　phase　sintering　point　were　decreased,　which　is　favorable　to　the　reduction　of　clinker　formation　heat.　The　revised　formation　heat　empirical　formula　of　fly　ash-doped　clinker　could　facilitate　the　thermal　calculation　of　furnaces　and　the　evaluation　of　thermal　efficiency.　©　2016　Trans　Tech　Publications,　Switzerland.