NOVELTY - Substrate contains 5-10 pts. wt. sawdust, 10-20 pts. wt. dairy manure, 5-10 pts. wt. chicken manure, 3-5 pts. wt. straw powder, 3-5 pts. wt. corn powder, 3-5 pts. wt. perlite, 3-5 pts. wt. vermiculite, 5-8 pts. wt. plant ash, 5-8 pts. wt. broom cypress fruit, 6-10 pts. wt. pine needle, 8-12 pts. wt. thunder god vine, 5-8 pts. wt. radix stemonae, 1-2 pts. wt. sodium alginate, 0.5-1 pts. wt. potassium humate, 0.5-1 pts. wt. sodium dodecyl sulfate, 1-2 pts. wt. sodium carboxymethyl starch, and 20-30 pts. wt. 15 %mass aqueous solution of sodium chloride.    USE - The substrate is useful for greenhouse cultivation of seedling (claimed).    ADVANTAGE - The substrate improves growth of seedling, is highly nutritious, and simple and convenient to use, and has good water-retaining property.    DETAILED DESCRIPTION - Substrate comprises 5-10 pts. wt. sawdust, 10-20 pts. wt. dairy manure, 5-10 pts. wt. chicken manure, 3-5 pts. wt. straw powder, 3-5 pts. wt. corn powder, 3-5 pts. wt. perlite, 3-5 pts. wt. vermiculite, 5-8 pts. wt. plant ash, 5-8 pts. wt. broom cypress fruit, 6-10 pts. wt. pine needle, 8-12 pts. wt. thunder god vine, 5-8 pts. wt. radix stemonae, 1-2 pts. wt. sodium alginate, 0.5-1 pts. wt. potassium humate, 0.5-1 pts. wt. sodium dodecyl sulfate, 1-2 pts. wt. sodium carboxymethyl starch, 20-30 pts. wt. 15 %mass aqueous solution of sodium chloride, and 30-50 pts. wt. soil. An INDEPENDENT CLAIM is included for method for preparing the substrate, which involves (a) crushing and uniformly mixing sawdust, dairy manure, chicken manure, straw powder, corn powder and soil, controlling water content of the mixture at 55-60%, adding corrosion accelerating agent to the mixture, heating the mixture, immediately performing fermentation of the mixture, and eliminating odor and rapidly killing harmful pathogenic bacteria, parasitic ovum and weed seeds during fermentation, (b) cleaning broom cypress fruit, pine needle, thunder god vine and radix stemonae, adding purified water and immersing the components in purified water for 2-4 hours, extracting the mixture for 3 times by adding water, combining the extract, heating and concentrating the extract to obtain concentrated juice, adding 95 wt.% ethanol to 10 wt.% concentrated juice, precipitating water-soluble impurities, uniformly dissolving the concentrate, filtering the concentrate using plate and frame filter press and then with micropore filter to obtain filtrate, heating and boiling the filtrate, recycling ethanol, centrifuging the filtrate, and performing UV sterilization to obtain traditional Chinese medicinal liquid, (c) adding 3-5 times water to the plant ash, stirring the mixture, precipitating the mixture, taking out the upper clear liquid, then filtering the mixture to remove residue, and sterilizing the obtained extract, (d) adding 15 %mass aqueous solution of sodium chloride to the sodium alginate, potassium fulvate, sodium dodecyl sulfate and sodium carboxymethyl starch, uniformly stirring the mixture, immersing the perlite in water solution for 3-5 days, and obtaining perlite having size of 100-120 meshes, and (e) immersing the vermiculite in the traditional Chinese medicinal liquid for 3-5 days, and obtaining the vermiculite having size of 120-150 meshes, and (f) mixing the products obtained in the steps (a), (d) and (e) in a ratio of 8:1:1, mixing and stirring the mixture, and spraying the product obtained in the step (c) to the mixture to obtain product.