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PURPOSE : An eco park utilizing on-site soil and a composition method thereof are provided to utilize on-site soil excavated to form a pond poured in a greening jute bag for forming a base soil bag, to form a floor side and a slope part of the pond by using the base soil bag, and to conveniently create the pond.CONSTITUTION : The first step is to excavate with a certain depth and to form a waterproof layer. The second step is to form a base of an artificial pond inside of the waterproof layer and to create an aquatic growing basement and a wet land growing basement. The third step is to form a vegetation/afforestation soil layer outside of the waterproof layer and to create a land growing basement. The fourth step is to plant or release plants and animals in the aquatic growing basement, the wet land growing basement and the land growing basement. In the second step, the base soil bag is prepared by containing the excavated on-site soil in the greening jute bag, and then is put on the waterproof layer. In the fourth step, the excavated on-site soil is used as a planting base soil. The base soil bag, which is arranged in a location to plant aquatic plants in the slope part or the floor side of the artificial pond, is removed, and the aquatic plants are planted in this location. An ecology observation route is formed around the artificial pond. A deck structure is established on the top of the artificial pond. An ecosystem cross-sectional observation wall is formed to observe a cross section from the soil layer of the bottom part of the artificial pond to the water surface.COPYRIGHT KIPO 2011