Abstract: In Liaoning province there are 25 species of trombiculid mites belonged to 2 families, 3 subfamilies and 10 genera. A discussion on the ecological and geographi cal distribution of the mites has been conducted on the dominant species, commonspecies and rare species in four different kinds of geographical landscapes. 1. East Liaoning mountain ous area and hilly land of the peninsula: there are 22 species of trombiculids. The dominant species are Leptotrombidium (L.) orien tale and the rare species are L.(L.) apodemi, L.(L.) cricethrionis, L.(L.) linji,L(L.) gemiticulum, Neotrombicula talmiensis and Neoschoengastia (Ns.)gallinarum,etc. 2. Liaohe plain: There are 8 trombiculid species. The dominant species is Leptotrombidium (L.) palpale and the rare species are L.(L.) liaoji. 3. West Liaoning mountain ous region and hilly region: There are 8 trombiculid species. The dominant species is Neotrombicula gardellai and the rare species are Helenicula olsufievi and Chiroptella (Oudernansidium)muscae. 4. Loess hilly plateau and dry grassland: There are 2 common species of trom biculids, Walchia fragilis and Cheladonta ikaoensis.

Key words: trombiculid mites——liaoning-ecogeographical distribution