The synanthrope flora in the “Codrii” Reserve territory is spread in the anthropic biotopes. Some plant species penetrate in meadows, clearings and especially in those places where the litter is destroyed. In forest communities where the ecological reconstructions are performed, the synanthrope species dominate, in other places substitute some native species, predominating in vegetal cover. The synanthrope flora of reserve includes 97 species of vascular plants, belonging to 26 families and 76 genera. Taxonomical composition of the synanthrope flora is dominated by representatives of families: Asteraceae (26 species), Brassicaceae (13 species) and Poaceae (12 species), which constitute 53.7%. The genera with more species are: Carduus, Cirsium, Sonchus and Setaria (with 3 species each). The plant species highlighted on the territory of the reserve are grouped into 4 categories of vital forms. The most species belong to the group of terrophytes representing 84.9%. Other groups participate unessential in the formation of bioform spectrum (hemicryptophytes – 9.7%, geophytes – 3.2% and chamaephytes – 2.2%). Analyzing their requirements to moisture factor, we see that the most numerous are xeromesophytes (50%) and mesophytes (34.9%). The xerophytes (6.5%), mesohygrophytes and euriphytes (with 4.3% each) have low percentages. According to the requirements for the air temperature, predominant are the mesothermal plants – 59.3%, which constitute more than half of the specific composition of the synanthrope flora. The moderate thermophilic species totaled 25.3%, but the amphitolerant species comprise only 15.4%. Taking into account the preferences to the soil reaction, in the synanthrope flora, the eurionic species predominate with 48.3%, followed by the light acid-neutrophil species – 37.4%. A significant share has the acid-neutrophil species, which records 11%. The neutro-basiphil species constitute 2.2%, but the acidophil – 1.1%. The analysis of geoelements revealed the predominance of Eurasian species (50%) and the Cosmopolitan species (15.9%). The Adventitious elements recorded 9.6%, the European – 7.4%, the Pontic – 6.4% and the Central European – 5.3%. The Mediterranean (3.2%), Sarmatian and Circumpolar geoelements (1.1% each) have insignificant shares.