In this work the woody plant species have been determined, which grow in in the southern part of the city Istanbul on the Marmara Sea Cost, which climate is somewhat warmer and drier than the nothern part as a habitat. Site inspections, photographing, sample collection and detection studies has been carried out in the selected 9 sample areas. The detected woody plants were evaluated within the SPSS analysis program; in terms of their distribution by the family names and also genus-species densities. Furthermore, the usage density of each plant taxa in this region has been identified, according to their occurrence in the sample areas. In order to determine the harmony of the plants within the ecological structure of the area; the "formula of plants deployed area" has been used. It is identified that the landscape design areas of the Istanbul Marmara coastal areas, has an important value of plant diversity within total of 204 woody plant taxa. The other important results identified in this study are, the intensively usage of exotic woody plants and also the reality that some of the woody plant taxa used in the landscape designs of this area are not ecologically suitable for this region.