Abstract: The abundant dumped coal gangue has caused the series production safety hazards and environmental pollution problems. Calcination activation technology has opened up a new way to realize the high quality and efficient use of useful elements and minerals in coal gangue. Nevertheless, there is still a lack of systematic explanation for the effect of calcined factors on the whiteness and activity of coal gangue. By exploring the influence of calcined factors on the whiteness and pozzolanic activity of calcined coal gangue, the changes in the composition of physical phase, micro-morphology, pore size distribution, whiteness and pozzolanic activity of gangue before and after calcination are obtained. The results show that the whiteness value and pozzolanic activity of dynamic calcined products are higher than those of the static calcined products. Moreover, the whiteness value of the static calcined products increases more than that of the dynamic calcined products at a calcination temperature of 600°C-900°C and a calcination time of 2h. Compare to dynamic calcination, the whiteness value of static calcination continues to increase with the extension of the calcination time. The sintering phenomenon of dynamic calcination is unobvious. The specific surface area and pore structure characteristics of static calcined products are superior to dynamic calcined products. Eventually, the optimal conditions of calcination method, calcination temperature, and calcination time for the coal gangue calcined product are dynamic calcination, 900℃ and 2h, respectively.