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The use of biological indicator for environmental monitoring has suddenly become popular in manyinternational organizations as well as domestic ones. Since the biological indicator species should be wellresponsive to native environmental change, development of native indicator species is prerequisite forenvironmental assessment and restoration program. Through regression analysis of mean density and pH,potential indicator species were screened from Namsan and Kwangreung where diferential environmentalstresses are influenced; Lasiobelba remota, Ceratozetes sp. Tectocepheus velatus, Neogymnobates sp. andOppia sp.3. Also keystone species in two study area were Lohmannia coreana, Ceratozetes sp., Rostrozetespulcherrimus, and Lasiobelba remota in Namsan Deciduous forest and Neogymnobates sp., Neogymnobatesdonghaksaensis, and Cultroribula tridentata in Kwangreung. Advantages and disadvantages of usingbiological indicator for environmental monitoring were further discussed.