Concrete is one of the most important, widely used and low price building material with appropriate ductility in construction industry. Due to its vast application, growing need of cement production and its harmful environmental effects such as emission of 7% of in atmosphere and considerable consumption of energy, it is important to provide an alternative production in order to move through sustainable development. One strategy to produce a concrete which is more compatible with environment and has less adverse effects associated with the production of Portland cement is alkali active slag concrete construction. The importance of concrete application as the main material in hydraulic structures is unavoidable. Dams and the related hydraulic structures are known as long servicing life structures. Their maintenance costs are high, so their durability is an important issue. Chemical factors, including the factors that effective in concrete durability. Sulfates attack, acids, sea water and ion chloride that causes electrochemical corrosion of steel reinforcement are chemical destructive agents which that will lead to concrete destruction. Because the attacks are done in the concrete body, factors attacker must be able to penetrate into the concrete and the concrete should be permeable; therefore concrete permeability is important and it is considered as one of the most important factors in determining the concrete durability. In this research, effective parameters on alkali activated slag concrete permeability has been studied. Alkali-activated slag concrete is produced by activating Isfahan steel plant slag with alkaline solution containing sodium hydroxide, sodium silicate and its compound with ordinary aggregates. The effective factors on permeability which considered in producing this concrete are including: alkaline solution to slag ratio, different curing conditions, replacement of various amounts of micro-silica and nano-silica with slag and adding the polypropylene fiber. The effect of these factors has been studied by different tests containing slump, specific gravity, compressive strength tests at the age of 28 and 90 days, water absorption short term and final, water impermeability, rapid chloride penetration test (RCPT) at the age of 28 and 90 days and carbonation tests under two cycles of 14 and 28 days. Moreover, to clarify some issues, scanning electron microscopy (SEM) and X-ray diffraction (XRD) tests was performed. In order to comparing the above mentioned results, ordinary concrete (concrete with ordinary Portland cement with compressive strength at 28 days 43.6 MPa ) was used as the control design. Using the statistics principles and by using Minitab software, the best alkaline solution to slag ratio was chosen 0.45. Also test results showed that the curing in the water is best curing and between all affecting parameters, replacing microsilica has best and most influence on the permeability of alkali activated slag concrete; And the negative effect of nano-silica on the permeability tests are other important result of this thesis. Key Words: concrete, alkali activated, slag, permeability, processing, microsilica, nanosilica, fibers, polypropylene.