Activation　properties　analysis　of　spontaneous　combustion　coal　gangue　was　carried　out　after　selecting,　crushing,　milling　and　sieving　the　coal　gangue.　X-ray　fluorescent　spectrometey　(XRF),　inductively　coupled　plasma-atomic　emission　spectrometry　(ICP-AES),　X-ray　diffraction　(XRD)　and　thermal　analyzer　were　employed　to　analyze　the　effect　of　different　mineral　and　different　composition　on　activation　properties,　and　compressive　strength　testing　was　employed　to　test　the　activation　properties　of　spontaneous　combustion　coal　gangue.　The　results　indicate　that　the　active　substance　in　spontaneous　combustion　coal　gangue　is　amorphous　SiO2,　amorphous　Al2O3and　κ-Al2O3;　the　activation　properties　are　improved　with　decreasing　crystallization　rate;　and　the　activation　properties　are　affected　by　the　structure　loose　ratio.　The　activation　properties　can　be　quickly　tested　through　the　solution　of　Si4+and　Al3+,　or　the　crystallization　rate　determined　by　XRD.