Reverse osmosis water treatment system usually consists of Three parts, pretreatment section and reverse osmosis host. Pretreatment is composed of quartz sand filter, activated carbon filter and resin softening or scale inhibitor adding device which can be effective for raw water pretreatment system in jelly sediment, rust and large particles.Activated carbon filter is effective adsorption residual chlorine and organic matter in raw water colloid, chemical pollution of heavy metals.Softening or scale inhibitor adding device can will most of the calcium and magnesium ions removal in raw water, effectively prevent the subsequent reverse osmosis membrane surface fouling, congestion raise recovery rate.Host system based on pressure difference driving force of a highly effective membrane separation technology, in the above raw water osmotic pressure water molecules penetrate film output pure water, and a large number of inorganic ions and organic ions in raw water, organic colloid microorganisms such as magazine with wastewater discharge outside the host system.This technology is widely used in drinking water engineering, liquor blending, food industry formula with water, pure water plant, high-grade flower breeding, animal husbandry and aquaculture, the boiler water supply in air conditioning, electronic industrial cleaning, chemical formula of water, pharmaceutical industrial water and seawater desalination, environmental protection, etc.