‘Fertile island’ characteristics of soil nutrient in Haloxylon ammodendron lands in North Xinjiang were studied by means of typical case survey and geostatistics. Results show that the roots of big and small Haloxylon ammodendron plants were relatively stronger in ‘fertile island’ effect, while wilted Haloxylon ammodendron was weak in the effect. In terms of soil nutrient contents in the rhizosphere of Haloxylon ammodendron a decreasing order of big Haloxylon ammodendron > medium Haloxylon ammodendron > small Haloxylon ammodendron. Soil nutrient enrichment rate in the rhizosphere of the plant varied sharply with growth stage, but at the canopy brim, it did not. Stem diameter, plant height and canopy size was positively correlated with enrichment of alkalytic nitrogen (p<0.01), and negatively correlated with enrichment of available K in the rhizosphere (p<0.01). However, enrichment of available P there was positively correlated with stem diameter (p<0.01). The mean effective range of nutrient enrichment of Haloxylon ammodendron was smaller than the average diameter of their canopies. Analysis by means of Kringing interpolation revealed that the soil nutrients in the rhizosphere of the plants were much higher than in other areas, demonstrating the characteristics of ‘fertile island’.