▎ 摘　　要

NOVELTY - The method involves constructing a fixed base. The fixed base is formed with two rows of grooves. A lower portion of the groove is formed with a drainage ditch. A bottom portion of the fixed base is provided with wheels for retracting to obtain a groove fixed base. A drainage layer is formed, where the drainage layer is provided with a bump embedded with the groove of the fixed base. A lawn module is fixed on the fixed base. A playground lawn module (5) is obtained. The playground lawn module is connected by an interlocking structure i.e. mortise and tenon structure. The playground lawn module is connected with a water storage device (3) through a drain pipe (31). The playground lawn module is assembled into playground size to obtain a playground lawn (6) i.e. natural lawn and/or artificial lawn. The drainage layer is formed as an inverted trapezoid shaped structure. The buffer layer is made of composite material of graphene/calcium carbonate. USE - Method for modular construction of a playground lawn such as a football field, a baseball field, a hockey ball and a lawn tennis game. ADVANTAGE - The method enables setting a buffer layer on top and bottom portions of the lawn layer, thus reducing trampling natural lawn and influence, increasing abrasion resistance of artificial turf, and improving service life of the lawn. The method allows the drainage layer to be provided with a bump, so that the fixed base is formed with the corresponding groove, thus enhancing fixing effect, and hence improving integrity of the playground lawn module. The method enables ensuring the drainage ditch is fixed in the fixed base to collect drainage to the water storage device, thus improving strength, water permeability, service life and speed of a subsequent assembling lawn, and reducing assembling time. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a playground lawn. Water storage device (3) Playground lawn module (5) Playground lawn (6) Drain pipe (31)