Abstract: The aim was to provide a theoretical basis for drought resistance and water conservation ecological Macadamia garden construction. The water consumption and production of Macadamia nuts were studied by different irrigation treatments in a field experiment, and the relationships between water consumption, water consumption law and yield were studied. The results showed that: water requirement was critical for Macadamia in flowering stage, fruit expanding stage and fruit oil accumulation period. The relationship of water consumption and production was not infinite simple linear. High water consumption could not result in high yield. The optimal irrigation quota was: 2806.09 mm in growth period, 54.22 mm in flowering and fruit-setting period, 104.47 mm in fruit enlargement stage and 226.69 mm in fruit oil accumulation period. The Macadamia should be irrigated every 10 days in flowering and fruit-setting period and every 8 days in fruit enlargement and fruit oil accumulation period. Water resource in these critical periods was the key factor for high production and quality.