In order to prevent silica gel from flowing around, the molds are fixed in a regular range with wood or wooden boards, and the first part of the mold is separated by wood and sludge when opening the die. There is no gap between the sludge and the mold, and the surface of the sludge is smooth and flat. After the above work is prepared, then apply petroleum jelly or spray release agent on the plaster mold or the mold. For smooth products, use a clean cotton cloth dipped in petroleum jelly and apply it evenly on the mold. Keep it for 30 minutes to make the mold. The product fully absorbs the petroleum jelly, and then wipes the surface of the mold with a clean cotton cloth, and the surface is required to be bright; and the textured product only needs to be evenly coated with the petroleum jelly to adjust the silica gel according to the formula. When mixing the silica gel, stir in irregular directions to make the curing agent and silica gel fully mix to minimize air mixing into the rubber. For smooth products, it is best to vacuum once when the first layer of rubber is applied, and keep the vacuum at -0.1Mpa. 7-8 seconds.