Tsutsugamushi disease, Scrub typhus, is notorious vector borne disease in Korea. There were more than 6,000 cases annually in 2005 and 2006. To make an evidence-based control strategy, we monthly surveyed chigger mites from Aug. 2005 to Jun. 2006 with Sherman live trap at different habitat around the village in four different areas. We collected 17,786 chiggers with 5 genera 14 species from 512 wild rodents ,which is mainly Apodemus agrarius. To identify the seasonal prevalence of chigger mites, we calculated Chigger Index (CI : No. of chiggers per a rodent). Seasonal prevalence of chigger showed typical bimodal pattern during epidemic period. Predominant species showed geographically different. Hapchun, where is located at the southern basin area, showed predominantly with L. scutellare (31.5%) and L. palpale (28.5%). However, Guryae showed similar pattern of predominant species with the midlands, showing L. pallidum (55.2%) and L. scutellare (29.9%), because it is located at the mountainous area. L. pallidum and L. palpale is predominant species at Jangan and Songsan, where are the located at the midland. Vector species is 92-97% of total chiggers in the high-risk areas. However, it takes 89% in the low risk area (Songsan). Especially, L. scutellare, known as high vectorial capacity of tsutsugamushi disease, is predominant species at the southern high-risk areas, occupying around 30% of total chiggers. High-risk area, Jangan, occupied a little bit higher (7.4%) than Songsan, low risk area. L. scutellare distribution is well matched with epidemic situation.