In order to study the correlations between different pozzolanic activity evaluation methods of calcined coal gangue,NMR,XPS,ICP,XRD techniques are employed.The pozzolanic activity of coal gangue calcined at different temperatures is evaluated by strength method,polymerization degree method,chemical method and XPS method.The correlations of these results obtained from different methods are analyzed.It is found that these evaluation methods can reflect the changes of pozzolanic activities,among which strength method and polymerization degree method are more sensitive to pozzolanic activity of calcined gangue than chemical method and XPS method.For calcined coal gangue,strength method and polymerization degree method are more appropriate for pozzolanic activity evaluation.There is an obvious correlation between strength method and polymerization degree method.