Abstract: Objective This study aims to develop a polysaccharide-based sand-fixing agent from fruit and vegetable processing by-products and to evaluate its application effectiveness under complex wind-blown sand con-ditions. Methods Wind tunnel experiments were conducted to investigate the changes in wind erosion rate, erosion depth, sediment discharge, and sediment transport rate under different wind regimes slopes, and wind speeds for four treatments: bare sand control (CK), water application (T1), 0.5% sand-fixing agent (T2), and 1% sand-fixing agent (T3). The contribution of each factor to wind erosion rate was further quantified. Results (1) Continuous crust layers formed after application of the sand-fixing agent, with thicknesses of 5.24±0.20 mm for T2 and 8.75±0.21 mm for T3; no crust formed in CK or T1. (2) The sand-fixing agent significantly reduced wind erosion rate in a concentration-dependent manner. Under the extreme condition of 20 m/s, 15° slope, and impact wind, the wind erosion rate of CK reached 23527.47 g/(m²·min), while those of T2 and T3 were 5601.85 and 190.87 g/(m²·min), respectively, representing re-ductions of 76% and >99% compared to CK. Under low-speed free-stream wind, T3 even induced a shift from wind erosion to sand deposition on the windward surface, and maintained crust integrity under a strong wind of 20 m/s. (3) The vertical distribution of sediment transport rate followed an exponential de-cay pattern (R² > 0.93) for all treatments. The sand-fixing agent altered the vertical allocation of sediment transport, increasing the proportion at the 10-20 cm height layer. Under the condition of 0° slope and 20 m/s, the proportion of sediment transport rate at the 10-20 cm layer was 14.64% for T3, significantly high-er than that for CK (6.40%) and T1 (10.08%). (4) Multifactor ANOVA showed that the sand-fixing agent concentration contributed the most (63%) to the wind erosion rate, much higher than wind speed (10.1%) and slope (10.3%). Conclusions The polysaccharide-based sand-fixing agent can significantly enhance the erosion resistance of sand surfaces, with agent concentration being the dominant controlling factor. The high-concentration (1%) treatment, by forming a thicker crust layer, enhances interparticle bonding and abrasion resistance, demonstrating stable performance under complex wind-blown sand conditions and exhibiting strong potential for engineering application.