The stability of sandy slopes is poor, as are the protective effects of conventional protection measures. To effectively protect sandy slopes with chemical sand consolidation technology, a new type of sand consolidation agent, TD-1, was developed. In order to study the effect of sand consolidation, proportion optimization tests, penetration tests, wetting-drying cycle tests, and field tests were carried out. The results showed that the strength of the sand samples increases with the increase in the potassium water glass modulus when the ratios of the incorporated silica phosphate, lithium silicate, and silica sol remain the same; the optimum amount of potassium water glass added was 3 % of the solidified sand. The strength of the samples containing the modifier obviously increases, and the permeability of samples with low-modulus potassium water glass is relatively better; the strength of the samples decreases gradually with the increase in the wetting-drying cycle index, and after three cycles, the strength tends to be stable. TD-1 can be used with soil spraying technology for slope greening protection, and the solidified product is good for plant growing.