In Korea, the backgrounds of predatory mite introduction are increase of the higher income level and the consumer interested in environmental-friendly agricultural products. So, the studies on pest control with natural enemy instead of pesticide have been increased. In early days of natural enemy research in Korea, domestic natural enemies as like Amblyseius womersleyi Evans were attempted for control of spider mites in orchard and greenhouse. As the number of crops and the cultivation area in greenhouse were rapidly increased till now, it is preferred not to find and mass-rear dominant species but introduce the natural enemy species from other countries which are suitable under greenhouse environment (high temperature, low humidity). Chilean predatory mite (Phytoseiulus persimilis Athias-Henriot) was a first natural enemy mite imported from other country and utilized for control of two-spotted spider mite in strawberry greenhouse. The attempt was successful and use of Chilean predatory mite was expanded national widely. After then, pest control by natural enemy has been increased and several companies which produce and sell natural enemies commercially were established. The government recommends the policy, the environmental-friendly agriculture without pesticide for safe and high-quality agricultural product, and gives financial support to farmers. The predatory mites to allow import into Korea in present are 4 species : Phytoseiulus persimilis Athias-Henriot, Amblyseius cucumeris (Oudemans), Hypoaspis aculeifer (Canestrini), and Amblyseius swirskii Athias-Henriot. These predatory mite natural enemies are mainly included in Phytoseiidae (Acari) and introduced and sold to control small animal pest as like spider mites and thrips.