Tree Wai, is a green protective cover. The center of the plate body has a tree hole, the hole around the tree with a number of leaking holes, hollow rate of 90% which is the ratio of cement and cast iron lid pierced several times, good drainage, so that the tree at the end of the grass can be fully exposed to air and sunlight. It has a beautiful appearance, simple and beautiful, high strength ,,, not be broken, mainly for street trees on both sides of the green landscape tree pool play a protective soil erosion and beautify the role of the environment, it is widely used in some cities municipal roads, gardens, squares, and other commercial and residential district. Around the tree, also known as tree Wai brick mold mold jargon for tree pool cover mold, by two or four symmetrical blocks butt plate body composition, usually at the center of the cover body is provided with a tree hole, surrounded by a number leaking hole . The main pool landscape tree trees play a protective soil erosion and beautify the role of the environment. Magnesite composite materials are cast iron, resin composite, etc. Features a brick mold around the tree, with toughness, high robustness characteristics. Second, with anti-corrosion and impact resistance Third, the use of polypropylene materials, low production cost.