【Objective】 Under the condition of ensuring the quality of the grass blanket, select the appropriate combination of substrate thickness and seeding rate in the production process of ecological grass blanket, and achieve the coordination and unity of ecological and economic effects in grass carpet production.. 【Methods】 Using Poa pratensis as the experimental grass species, 12 indoor potted treatments were established, combining 3 sowing rates (15, 30, 45 g/㎡) with 4 substrate thicknesses (3, 5, 7, 9 cm). This was done to examine the characteristics of sand-based ecological grass blankets under varying conditions of sowing rates and substrate thicknesses, and to holistically assess the quality of the blanket formation. 【Results】 The results revealed significant variations in the quality indicators of the early maturing grass-based ecological carpets across different treatments. The Z9/45 treatment yielded the highest plant density, aboveground biomass, and root biomass in the grass carpet. The Z3/15 treatment had the highest chlorophyll content, while the Z7/45 treatment had the highest root tensile strength and root vitality. The Z5/45 treatment had the highest root length density, while the Z9/15 treatment had the smallest leaf width and the best texture. The Z9/45 treatment received the highest comprehensive score for carpet formation traits, as assessed by both variation analysis and membership function methods.. 【Conclusion】 The Z9/45 treatment of the grass blanket not only demonstrated excellent plant density, aboveground biomass, and root biomass but also exhibited superior overall performance. The optimal combination for preparing the early maturing grass blanket with sand-based ecology was a substrate thickness of 9 cm and a sowing rate of 45 g/㎡.