Saemankeum is the largest region, changed into reclaimed region in Korea, recently. The first purpose of Saemankeum reclaimed region is the development of new farmland. Since 2006, the construction of embankment, Saemankeum region has been isolated from the sea, slowly dried and changed into the land. In order to examine the change of reclaimed region related with the formation of new farmland, we examined the soil chemical properties and the emergences of the soil mesofauna and flora in Saemankeum reclaimed region in 2006, 2011, separately. We investigated three locations in Saemankeun in pedological parameters - pH, organic matter, P2O5, SiO2, EC, T-N, Ex. Cation and CEC. Also, soil mesofauna groups, such as Diplura, Homoptera, Coleoptera, Dilptera, Lepidoptera, Hymenoptera, Collembola, Acari, Annelida, etc, have been examined. Pedological parameters were improved, not enough for agriculture and many kinds of soil animal were newly appeared in reclaimed region. Additionally, new flora was formed and slowly changed into various communities.