A descriptive cross-sectional survey was conducted in 382 parents of 5 years old and younger students studying at preschools in Thanh Hai commune, Phan Rang city, Ninh Thuan province in 2013 to describe knowledge and practice of preschooler's parents in this study site. The results showed that parents having proper knowledge of Enterobius vermicularis (EV) shape
objects of EV infection and the age infecting EV were 48.2 percent
68,8 percent and 38,5 percent respectively. For causes of EV infection, there were 67.3 percent parents having proper knowledge when they supposed EV infected through oral way. Percentage of parents with proper knowledge of places having EV eggs, symptoms and harms of EV infection was 13.6 percent, 52.1 percent, 66.8 percent, respectively. There were a relatively high percentage of parents having proper knowledge of preventing EV infection (45.0 percent), however proper knowledge of measures for preventing EV infection was only 41.1 percent. The results also showed that percentage of parents dressing up for their children properly was 89.8 percent. Percentage of parents having proper practice in hand hygiene for children was 21.7 percent. For de-worming practice for children, percentage of parents having proper practice was 20.4 percent.