Abstract: Abstract: Water can cause unstable conditions in sand slopes, such as surface erosion, soil erosion, and slope collapse, and other serious damages. In this paper, a modified cellulose polymer GCMC(gelatinous carboxymethyl cellulose) sand-fixing agent was developed to show a strong dialysis cementation and absorption characteristics on the surface of soil and rocks. 1) An adsorption test was carried out to investigate the behavior of adsorption mechanics and erosion resistance on the sandy fixation by the modified GCMC sand-fixing agent. The “reinforcing soils” were prepared using various liquid-solid mass ratio (1:1-1:4), and then verified under seven adsorbing duration (10-360 min) and the centrifugal oscillation at 2 400 r/min speed for 10 min, finally measuring and drying the adsorption liquid. The results showed that the optimal adsorption amount was achieved when the liquid-solid mass ratio was 1:3, while the adsorption amount was about 84 mg/g at the equilibrium time using the modified GCMC sand-fixing agent. The fitting adsorption kinetics model for the GCMC sand-fixing agent sorption onto sand particles followed the presudo second-order law, while the adsorption mechanical behavior belong to a sort of chemical adsorption. 2) A water stability test was performed on an independently developed disintegration device under the various curing time (3-28 d) of the "reinforced soil", and the hydrolysis time of 24 h. This results showed that the disintegration rate of the specimen was 34% at the curing age of 3 d, the disintegration rate was 18% at curing age of 7 d, the disintegration rate was 11% at the curing age of 14 d, and without disintegrating at the curing age of 28 d. It inferred that the longer the curing time of the specimen, the higher the cementing strength of the "reinforced soil", i.e. the better stability. Furthermore, the particle size of the water stable aggregates was mainly concentrated in the range of 1-5 mm, and the volume fraction of the particle size greater than 5 mm was up to 30%. In the water stable aggregates, the volume fraction of the particle size at 1-0.25 mm decreased from 21% at the curing age of 3 d to 19% at the curing age of 14 d, while the volume fraction of the particle size greater than 1 mm increased from 74% at the curing age of 3 d to 80% at the curing age of 14 d. With the increase of the curing age, the mean weight diameter of water stable aggregates increased from 2.91 mm at the curing age of 3 d to 3.29 mm at the curing age of 14 d, and the geometric mean diameter increased from 2.01 mm at the curing age of 3 d to 2.32 mm at the curing age of 14 d. These findings can provide the promising applied data and fundamentals of the modified cellulose polymer sand-fixing agent for the soil and water conservation in sandy soil areas.