One of the most important building materials in civil engineering projects is concrete, which is being extensively used all around the world. However, there concerns in the use of concrete in construction attempts regarding its mechanical properties and durability in different settings and environments. Therefore, there has been a great incentive to find out some ways to improve these properties in concretes. One of the most popular ways, at least in theoretical attempts, is the use of Nano-silica in production of concretes. There have been several studies on the application of this agent to improve different properties of concrete. The present study is a review on the use Nano-silica in production of concrete in order to improve its mechanical properties and durability.