Within this study which is carried out in the historical peninsula of Istanbul, the current woody plant taxa of sample areas such as park, square, mosque garden, palace garden and botanical garden, has been identified. Site inspections, photographing, sample collection and detection studies has been carried out in the selected 7 sample areas. The detected woody plants were evaluated within the SPSS analysis programme; in terms of their distribution by the family names and also genus-species densities. Furtermore, the usage density of each plant taxa in this region has been identified, according to theiroccurece 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, which was developed by Schroeder (1976).