Pot experiment was conducted to study the effects of different NO-3-N/NH 4-N ratios on nutrient and yield of amaranth in different condition of water.The results showed that the N,P,Fe contents of amaranth increased and the K and Ca decreased with the increasing of NH 4-N/NO-3-N ratio in the same irrigation amount.The yield of amaranth increased with the increasing of NO-3-N/NH 4-N ratio in the same irrigation amount.The N,P,Fe contents of amaranth increased with the increasing of irrigation amount;the K,Ca contents and yield of amaranth were highest in middle irrigation amount.