This study was carried out to investigate the flora of Icheon-si (Gyeonggi-do). This work was investigated during the April to November in 2011. Some areas 2002, 2004, 2007 collected data were used. Vascular plants based on voucher specimens were summarized as 547 taxa, including 99 families, 313 genera, 475 species, 4 subspecies, 58 varieties, and 10 forms. Among the investigated 547 taxa, 6 Korean endemic species, 7 rare plants and 43 specially designated plants by the Ministry of the Environment were also included. A naturalized plants were 47 species, correspond to 14.6% of totaling 321 species appeared in South Korea.