Abstract: Ecological water demand is one of the hotspots in water issues, especially in the arid areas whose eco-environmental condition is sharply deteriorated. By the method of Aweliyongrufe, this paper calculated the ecological water demand of Minqin Oasis. The results indicated that the minimum ecological water demand of existing vegetation in Minqin Oasis was 1.4927×10⁸ m³·yr^-1, while the current ecological water use was only 0.3525×10⁸ m³·yr^-1. Such a serious deficit of ecological water demand was mainly due to the water use for farmland irrigation, which accelerated the deterioration of ecological environment in Minqin Oasis. Based on the analysis, the strategies of ecological reconstruction in Minqin Oasis were put forward.

Key words: Fraxinus mandshurica, Phassus excrescens, Biology, Occurrence regularity