With the result of urbanization in the second half of the 20 th. Century when there was a transformation, not only within the core of the cities, in the socio-demographic, economic and physical structure of metropolitan cities. But also it spread out the peripheries of the cities. This effect between the metropolitan core-periphery and the transformation have between with Istanbul metropolitan periphery too. In this paper, as an example pf developing country's metropolitan, the change and the transformation in istanbul city periphery, is put forward with process analysis.