The power loss of modern stable ZnO varistor ceramics decrease steadily during the dc aging, which follows a non-Arrhenius aging pattern. In this paper, they were aged at elevated temperatures. It was found that they underwent a transition from non-Arrhenius to Arrhenius aging, when the aging temperature increased from 100°C to 160°C. The power loss of the samples aged above 150°C showed an obvious increase trend, which was reported as a typical characteristic of Arrhenius aging. Noticeably, the dc aging of the sample aged at 100°C was reversible and the density of interface states (DOS) was almost unchanged. When the aging temperature exceeded the transition temperature (150 o C in this paper), the aging cannot be recovered and the DOS decreased after aging. It was proposed that the DOS might be responsible for the transition of ZnO varistor ceramics.