Abstarct: This study is baxsed on survey on soil inhabitiing laelapidae that was carried in year 2015 in different habitats of Shahrood region. In this study, 25 species belonging 10 genera and 3 subfamalies were collected and identified, one of these species is new to science, and one species is new record for the mites fauna of Iran, They were marked with (*) and (**) respectively and which all species considered as new records for the mites fauna of Semnan Province. According to results of Laelaspisella berlesi (45) was the most abundant and Gaeolaelaps kargi, Gaeolaelaps angusta & Pseudoparasitus hajiganbari (0/54) was least abundant. The highest Margalef index, Shannon-Wiener’s diversity index and Simpson index were calculated for Bastam. Identified species are as follows: Subfamily Hypoaspidinae: Cosmolaelaps rectangularis (Sheals, 1926); Cosmolaelaps vacua (Michael, 1891); Cosmolaelaps lutegiensis (Shcherbak, 1971); Gaeolaelaps aspratus (Berlese, 1904); Gaeolaelaps aculieifer (Canestrini, 1884); Gaeolaelaps angusta (Karg, 1965); Gaeolaelaps kargi (Costa, 1968); Gaeolaelaps minor (Costa, 1968); Gaeolaelaps nolli (Karg, 1962); Gaeolaelaps queenslandicus (Womersley, 1956); Geolaelaps arabicus (Hafez, 1982); Euandrolaelaps karaawaiewi (Berlese 1903); Euandrolaelaps sardoa (Berles, 1911); Pseudoparasitus dentatus (Halbert, 1920); Pseudoparasitus hajiganbari Kazemi, 2014; Ololaelaps gamagarensis (Jordaan & Loots, 1987); Hypoaspis sp.n*. Subfamily Melittiphidinae: Laelaspis humeratus (Berlese, 1904); Laelaspis pennatus (Joharchi & Halliday, 2012); Laelaspis dariusi Joharchi & Jalaeian, 2012; Laelaspisella berlesi; Joharchi, 2016 Gymnolaelaps myrmophilus (Michael, 1891); Gymnolaelaps sp**. Subfamily Laelapinae: Haemolaelaps shealsi (Costa, 1968); Haemolaelaps casalis (Berlese, 1887). All are deposited Acarology and Entomology collection, Department of Plant Protection, College of Agriculture, Shahrood University of Technology, Shahrood, Iran.