Environmental impact assessment is considered as a tool for environmental planning and management of development projects. There are several methods of environmental impact assessment. To choose the right method for each project, one should pay attention to a set of conditions and characteristics such as method specifications, environment characteristics, and the nature of the project. The purpose of environmental impact assessment is to identify and systematically value the potential effects of projects, programs, plans, policies and laws on the physical, chemical, biological, cultural, economic and social components of the environment. The first goal of environmental impact assessment is to encourage planners and decision makers to look at and pay attention to the environment and ultimately succeed in taking actions that are compatible with the environment. Environmental impact assessment is actually a process that includes detection, prediction, assessment and mitigation of biophysical, social and other similar effects from developments proposed by decision makers and commissions. This process is designed to ensure that the impacts of the developments are well understood and accounted for before they are implemented. This assessment causes all the effects and environmental consequences to be considered by weight or other economic and social effects during the implementation of development plans. If this stage is done well, its profit will be determined in the same planning stage.