An　economical　and　widely　available　raw　material　is　essential　for　the　application　and　populari-zation　of　geopolymer.　Due　to　the　vast　reserves　of　natural　clay,　calcined　natural　clay　is　considered　a　cost-effective　geopolymer　raw　material.　The　present　study　aims　at　developing　a　high-ductile　engineered　geopolymer　composites　(EGC)　using　calcined　natural　clay.　Firstly,　natural　clay　as　a　construction　waste　was　ground　and　calcined,　and　the　calcined　natural　clay　was　mixed　with　ground　granulated　blast　furnaces　slag　(GGBFS)　and　polyvinyl　alcohol　(PVA)　fiber　to　prepare　geopolymer　composite　samples.　Then,　the　mini　slump　and　uniaxial　tensile　test　were　conducted　on　the　geopolymer　composite　samples,　and　the　digital　image　correlation　technology　(DIC)　was　used　to　further　analyze　the　effect　of　the　slag　and　fiber　contents　on　the　tensile　behavior　of　EGC.　Finally,　the　optimal　slag　and　fiber　contents　for　EGC　with　highest　ductility　were　proposed.　The　results　showed　that　the　natural　clay　exhibited　a　certain　reactivity　after　a　thermal　activation　process　due　to　the　presence　of　a　small　amount　of　kaolinite.　The　tensile　properties　of　geopolymer　composites　prepared　by　calcined　natural　clay　were　significantly　enhanced　with　increasing　fiber　content.　Meanwhile,　the　incorporation　of　slag　could　enhance　the　tensile　properties,　while　excessive　slag　content　decreased　the　tensile　properties.　The　EGC　with　10.0%　slag　content　and　2.5%　fiber　content　exhibited　the　highest　ductility,　with　an　ultimate　tensile　strength　of　3.61　MPa　and　a　tensile　strain　capacity　of　6.59%.