Abstract: The post flare coronal arch of 6-7 Nov., 1980 was formed at three hours a-fter the onset of the parent flare (AR2779) and revived 11 hr and 25 hr after its formation. Both these revivals were caused by two-ribbon flares with growing systems of loops. It is proposed in this paper that shock wave, which was produced by the parent flare, and Petschek reconnection are effective revival mechanisms for post flare arch of 6-7 Nov., 1980. The energy equation taking into account radiati ve cooling, heat conduction, shock wave heating, and Petschek reconnection is deri-ved and computed. The calculated results are in agreement with observational cur ves given by Svestka according to SMMdata.