Coal gangue needs a lot of farmlands to be disposed of and causes pollution problems to the ecological environment in mining area.A systematical tests on chemical constituents,durability and harmful substances content,physical and mechanical properties of the spontaneous combustion coal gangue generated from Gaode,Fuxin City of Liaoning Province were made. With crushed spontaneous combustion coal gangue as the light coarse aggregate that has the performance meeting all requirements set forth in national standard,steel fiber as reinforced material,five specimens with different use level of steel fiber on the basis of all the data meeting the national standards requirement about lightweight aggregate were prepared;workability and homogeneity,compressive strength after hardening,split and tensile strength and flexural strength of the mixture were determined;Based on test results the relationship between steel fiber volume fraction and concrete strength is established.The results show that when the steel fiber volume fraction is less than 2%,with the increase in steel fiber volume,spontaneous combustion coal gangue lightweight aggregate concrete has increasing compressive,tensile and flexural strength with flexural strength being the highest,and the mechanism is analyzed.