Site selection is one of the primary decisions in the start-up process and town planning, development or relocation of industries of all kinds. Building of a new industrial system is related with long term investment, and in this sense planning the site are a significant point on the road to progress or failure of the industrial system and that effect on all other services in the city. One of the main objectives in industrial site selection is finding the most suitable site with required conditions. A large number of researchers depend on GIS because the availability and its wide uses in site selection. GIS is a combination with other systems and methods such as the method for multi-criteria decision making (MCDM). Multi-criteria decision analysis (MCDA) techniques can be used below such conditions to classify and rank options for subsequent complete evaluation, or to specify acceptable from unacceptable potentiality for many sites. Analytical Hierarchy Process (AHP) can beneficially be used for assigning weights to various criteria in MCDA. The aim of the present study is to develop a methodology to use GIS and MCDA for a new industrial site in Al-Nasiriyah city. In this paper, we will try to find optimum solution for industrial estates site selection and applying solution in GIS.