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Nanomaterials (NMs) have significant technological advantages due to their unique properties but their release into the environment also carry potential eco-toxicological risks. Cu 2 O NMs have numerous industrial and commercial applications, however less is known about the risks to human health and ecosystems. This study investigated different shapes of nano-Cu 2 O (cubic and octahedron) with humic acid (HA: 2 mg/L and 10 mg/L) on the reproduction, growth, survival rate and Cu accumulation in the two-generations of Daphnia Magna species. Nano-Cu 2 O cubic and octahedron shapes were analyzed by SEM, demonstrating {111} and {100} facets. The results indicated that octahedron has the more evident toxic effect than cubic shape for both generations. Continuous exposure to nano-Cu 2 O exhibited negative effects on body length, cumulative neonates and Cu accumulation in filial generation F (1). Survival rate of Cu 2 O octahedron was the least 66%, while Cu 2 O cubic was 73% for parental generation F (0). In addition, HA showed a significant reduction in the toxicity of nano-Cu 2 O for both generations, leading to an enhanced survival rate, body length and reproduction. This study provides insights of the long-term effect of different shapes of nano-Cu 2 O in the existence of humic acid to the multi-generations ecosystem., (Copyright © 2020 Elsevier Inc. All rights reserved.)