The study was investigated the effect of organic additive and temperature change of accelerator for shotcrete. Then the amount of accelerator, temperature and W/C ratio were experimentally determined. The effect of hydration time and hydration heat of concrete on organic additive(TEA)amount were analyzed by DSC, SEM and XRD. As a result, we found that the hydration heat was increased and hydration time was decreased with TEA amount(5wt%). Hydration reaction rate of Pottasium accelerator was ordered PA < PC-3 < PC-5 < PC-8.