In this paper, results of the research p roject, entitled "Determining the Spatial and Structural changes in the Forest Areas around İstanbul using Remote Sensing Data and Generating Forest Information System", are presented. The project was financially supported by I.U Research Fund with the number of 636/210994. The purpose of this study was to determine how forested, residential, and other land use forms have changed around İstanbul in a decade (from 1984 to 1994). Therefore, reliablc ground truths and evaluations, which depend on them, are follovved. Another purpose of the study was to reveal a metlıodology that inclines change detection analysis together with integration of GIS and Remote Sensing data. Prior to this study, a pilot (360 km2 area) was selected around İstanbul and topographic maps (1/25000), forest management maps (1/25000), and Landsat5-TM sateiiite data from 1984 to 1994 years were obtained. In the project area, in order to evaluate and study the changes in the land use forms (vvater bodies, deciduous and Coniferous forest areas, and other non-forest areas) from 1984 to 1994, a monitoring system and the geographic database were generated. Obtained results were presented to form the maps, and graphics.