Many studies supported that climate change has influenced on distributional range shift, expansion and contraction of a large number of species. But, very little is known regarding the distributional changes of Korean species, especially subtropical terrestrial orchids. To provide the evidence of northward expansion and contraction of some species’ range by climate change, we focused on the subtropical terrestrial orchids of Jeju Island, where is a hotspot of plant diversity of Korea. Approximately one thirds of taxa of Korean flora and more than two thirds of Korean orchids are distributed in the Jeju Island. According to the climate data, the average temperature for the year of Jeju Island was increased 1.3℃ during 1930’s-1990’s, and winter was shortened 36 days and spring was lengthened 10 days than those of 1930’s. The climate change has effected to distribution range and the number of individuals of orchid species in Jeju Island. The number of some orchids was reduced and became very rare: Dactylorhiza viridis var. viridis, Gymnadenia conopsea, and Platanthera mandarinorum subsp. maximowicziana. On the other hand, the distribution range of some orchids was also expanded to northward: Cymbidium kanran, Neottia kiusiana, Goodyera biflora, Lecanorchis japonica, Herminium lanceum var. longicure and Cyrtosia septentrionalis. These orchids were distributed restrictedly in Jeju Island, but now they are also found in the southern part of Korean peninsula. The expansion of these orchids to northward is keeping up with that subtropical climatic region has expanded to the Southern coast of Korean peninsula from Jeju Island. Moreover, some subtropical terrestrial orchids were found in Jeju Island: Habenaria iyoensis (Lee and Lee, 2007), Nervilia nipponica (Kim et al., 2009), Platanthera brevicalcarata (Eum et al, 2012), and Neottia japonica (So et al., 2013). In the past, the distribution of these subtropical orchid species was limited in Taiwan, South China and Southern Japan. But now, they are expanded to Jeju Island of Korea. We cannot decide critically whether these new appearances are caused by long distance dispersal event or new foundlings in recent. However, the appearance of a mature subtropical plant in Korea fits well into the phenomenon that northward expansion of subtropical orchids driven by climate change. Actually, it most likely to reflect a growing subtropical-like climatic influence in the Jeju Island. These distributional range contraction or expansion of some subtropical orchids of Jeju Island supported that orchids adapt to the change of environment by shifting to favorable habitats either horizontally, vertically or both. The distributional shift or expansion of orchids to seek their favorable habitats driven by climate change is becoming one of the important factors for its conservation. For the long term conservation of orchids, we need to continue to monitor the orchid distribution responding to the ongoing and rapid climate change.