Bentonite is an abundant mineral resource of xinjiang province, it has good performance in absorbing water. Beeause of their excellent charaeteristies，superabsobrents are widely used in agriculture ,hortieulture, sealing composite and medicine for durg delivery and so on. (1) First of all, the bentonite is on the aqueous method depuration. Inspected the quality score, time and dispersing agent three kind of factors . Through the test, we can get the final determination is: quality score 20%, time 2h, adding 0.2% dispersant. (2) Second, uses the GB 5009.7-85 method to measure and determination of reducing sugar content after hydrolysis of starch, To determine the optimal conditions for hydrolysis is : 5g starch, 150mL distilled water, 6mLHCl (1:1), 95 ℃ water bath, 90min, get the largest rate is 52%. (3) Thirdly, by the orthogonal experimental analysis and single factor analysis, determine the absorption rate of distilled water and saline, and get the maximum absorption of distilled water and saline is 398 times and 143 times. (4) Finally, a variety of performance of bentonite composite aquasorb is tested. determination of particle size on the absorption capacity of distilled water, as well as the ability to absorb the effects of saline, determine that between the 100 and 200 has the optimal capacity of the absorption of distilled water and saline: Determination of absorbent bentonite composites aquasorb rate, experimental results show that composite aquasorb absorption in distilled water after 5.5 hours to reach saturation, 3.5 hours after the draw saline saturated; Aquasorb composite thermal stability test results show that with increasing temperature, Bentonite Composite aquasorb gradually release starch to absorb water; re-absorption capacity of the test and found that both the re-absorption capacity of distilled water or saline and then the ability to absorb at room temperature both have good repeatability, and absorptive capacity can be achieved, respectively, the initial absorption rate of 96.73% and 92.31%. This paper aims to take bentonite of Xinjiang province as raw material, acrylic acid grafted starch composites, to be the establishment of a stable, good salt tolerance, but also can be degraded in the soil water of the materials, but also proved complex water agent in high-temperature water and then after a very prominent absorption capacity, which in Xinjiang drought, high temperature, drier climate of great importance.