The purpose of this study was survey of porcine reproductive and respiratory syndrome (PRRS) virus antibody in Gyeongbuk province by enzyme-linked immunosorbent assay (ELISA). Total 690 samples collected from 15 pig farms were tested. The overall seroprevalence of PRRS virus antibodies was 63.2% (436/690) and 13 farms of 15 farms had at least one pig with PRRS virus antibodies. The seroprevalence of PRRS virus antibody varied with age. Results in 1 to 30 day old, 31 to 60 day old, 61 to 90 day old, 90 to 120 day old and over 120 day old pig were 58.3%, 36.0%, 68.0%, 84.0%, 80.0% and sow were 61.9% respectively.