TECHNOLOGY FOCUS - BIOLOGY - Preferred Method: The step of desalting comprises adopting a roller sieve or a vibrating sieve with a bore diameter of 1-1.5 cm, sieving the compost to obtain the compost using the sieved object as raw material by rotary drum mode or vibration mode, adding 2-3 times of water in the sieved compost, immersing for 48 hours and stirring 2-3 times in the immersing process, filtering the immersed compost with a nylon screen with a bore diameter less than or equal to 60 mesh, and removing the gravity water in the compost and air drying. The step of deploying the matrix comprises directly doping calcium superphosphate in the compost, dissolving ferrous sulfate, urea and potassium sulfate with water to prepare into an aqueous solution, and adding to the compost by spraying mode. The step for pressing the matrix block comprises diluting the modified maize flour adhesive with clean water into 50 times of adhesive diluent, spraying the adhesive diluent to the compost matrix prepared in the step for deploying the matrix, where the moisture content of the compost matrix after wetting is 55-65%, pressing the wetted compost matrix by the mold into the matrix block, air drying, drying or roasting the formed matrix block to obtain the matrix material of lawn plantation with a moisture content of 30-40%. The mold is a square frame with the length, width and height of 150 cmx 100 cmx 20 cm prepared by polyvinyl chloride (PVC) plate or stainless steel plate. The step for pressing the wet compost matrix by the mold into the matrix block comprises placing the mold frame on a smooth plane, filling the compost matrix wetted by the adhesive diluent, pressing the surface of the compost matrix after filling, taking out the mold after pressing to obtain the matrix block with a thickness of 18-20 cm. The step of pressing the seed block comprises pressing the seed block by uniformly mixing Festuca arundinacea and annual bluegrass in a mass ratio of 4:1, grinding into 60 meshes according to 8-10 kg/m3 to uniformly mix with the matrix material, paving the mixture in the tray with a flat bottom into the thin sheet with a thickness of 5 mm, diluting the modified maize flour adhesive with clean water into 50 times of adhesive diluent, wetting the thin sheet on the tray with the flat bottom by the adhesive diluent to the moisture content for 55-65%, pressing the wetted thin sheet into the seed block with a thickness of 3 mm, drying the seed block with the tray with the flat bottom in a blast dryer at 35-40 degrees C to obtain the seed block with a moisture content lower than 15%.