【Background】 The alien invasive pest, the western flower thrips, Frankliniella occidentalis(Pergande) arrived in Beijing, China in 2003, and became one of the major pests of vegetables. 【Mehtod】The thrips on the main flowers were surveyed by taking 258 samples in 115 counties in Shandong Province in 2008~2009. 【Result】We identified 11 species of thrips on the main flowers in Shandong including Frankliniella intonsa, Thrips hawaiiensis, Thrips flavus, Frankliniella occidentalis, Thrips palmi, Thrips tabaci, Frankliniella tenuicounis, Aeolothrips fasciatus, Microcephalothrips abdominalis, Aeolothrips melaleucus, Taeniothrips eucharii, F.intonsawas the dominant species. The western flower thrips was found on the flowers in 18 counties in Shandong Province. Densities were highest in Rongcheng county, Qingdao urban districts, and Dezhou city, where they constituted 51.86%, 34.21%and 33.88%, respectively, of all thrips. The range of relative abundance was between 1.39%~18.75% for the other 15 areas.