The role of focus of economic activities in increasing Tehran mega city

Tehran has been as a center, main city and focal point of giving all decisions large and small politics in field of various points such as official, political-economical and social. This focus politics caused focal activities likes economical, social, educational and etc which has made several and various job opportunities so these several job opportunitiesattracted many populations from all over the country.Now this question brings up that among focal economical and increasing population ofTehran has connected. According the above question many questions are bringing up, so in this article just paysattention to 2 pivotal questions. 1. How much is the focal several of economical activities in province, cities of Tehran?2. What has been focal economical activities effected in increasing population andextension of physical framework of Tehran mega city? For research in this article used library and study documents methods such as using the result of Population and Housing & Census etc. Also spss soft wave and two variable equation (y= a+bx) has used for assimilation. Result of this research show that among the rate of social activities (industry and services) and increasing population which makes immigrations has meaningful relation and in this relation portion of services department as compared with industry department is more. Increasing population in Tehran mega city has made various problems likes traffic,environmental and Causes of these reasons should examine in order to forecast suitable program for decreasing immigration.