This paper introduces the first results of deuterium retention on the Experimental Advanced Superconducting Tokamak(EAST) using particle balance. In the fall 2010 EAST experiments with a full graphite wall, the average deuterium retention fraction was about 19%(including disruptive shots) and 38%(not including disruptive shots). Fuel retention for the short-and longpulse discharge was different. The H-mode discharges had a slightly lower fuel retention than the L-mode discharges. However, it was observed that disruptions introduced outgassing from the wall. Wall conditioning, such as lithium coating, increases retention.
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