NOVELTY - A geothermal flooring substrate comprises paraffin, complex flame retardant adhesives, wood fiber, stearic acid, PVC, corn straw powder, sisal fiber, acetate fiber, asbestos fibers and antioxidants. A complex flame retardant adhesive agent contains urea resin, natural rubber, acrylonitrile butadiene styrene, vinyl triamine, phenyltrimethoxysilane, chlorinated paraffin, KH560 (RTM: ( gamma )-glycidylpropyltrimethoxysilane), expandable graphite, nano water talc powder, sodium hydroxide, dibutyl phthalate, and epoxy soybean oil as raw materials.    USE - Geothermal flooring substrate (claimed).    ADVANTAGE - The skid-proof of the wooden floor is ensured with high insulation property. The wooden floor is used comfortably with excellent flame retardant, moisture-proof, and antioxidant property, and has increased strength.    DETAILED DESCRIPTION - A geothermal flooring substrate comprises 1-3 pts. wt. paraffin, 10-20 pts. wt. complex flame retardant adhesives, 50-60 pts. wt. wood fiber, 1-3 pts. wt. stearic acid, 40-60 pts. wt. PVC, 7-8 pts. wt. corn straw powder, 5-10 pts. wt. sisal fiber, 8-12 pts. wt. acetate fiber, 3-5 pts. wt. asbestos fibers and 1681-3 pts. wt. antioxidants. The complex flame retardant adhesive agent contains 17-20 pts. wt. urea resin, 13-25 pts. wt. natural rubber, 3-5 pts. wt. acrylonitrile butadiene styrene, 0.2-0.4 pts. wt. vinyl triamine, 1-2 pts. wt. phenyltrimethoxysilane, 1-3 pts. wt. chlorinated paraffin, 1-2 pts. wt. KH560 (RTM: ( gamma )-glycidylpropyltrimethoxysilane) 3-5 pts. wt. expandable graphite, 5-8 pts. wt. nano water talc powder, 3-8 pts. wt. sodium hydroxide, 1-3 pts. wt. dibutyl phthalate, and 1-2 pts. wt. epoxy soybean oil as raw materials. An INDEPENDENT CLAIM is included for a preparation of geothermal flooring substrate, which involves adding urea-formaldehyde resin, natural rubber, chlorinated paraffin, and KH560 (RTM: ( gamma )-glycidylpropyltrimethoxysilane) in kneader, pre-heating to wall temperature of 140-160 degrees C, then adding acrylonitrile butadiene styrene, dibutyl phthalate, and vinyl triamine, kneading for 10-20 minutes, and granulating the material after the addition of remaining raw materials in parts by weight at 150-160 degrees C under kneading of 10-20 minutes and molding extruder.