This study focuses on the qualitative research on the Dengue Hemorrhagic Fever preventing behavior of the people in epidemic area and non epidemic area in Khuanpho subdistrict, Satun province. The data were collected over 5 months. The key informants were community leaders, the chairman of Local Administrative Organization, patients and their parents, public health officers, community health volunteers and people from both areas. The data were collected by in-depth interviews, group conversation and random testing for Aedes mosquitoe larvae in the studied areas. The data was qualified by the triangulation method and analysed by interpretation and summarization of the important content.

The results showed that most people of both areas had basic knowledge about Dengue Hemorrhagic Fever, although those from the epidemic area lacked intention to control the Aedes mosquitoes, index of Aedes mosquitoe larvae higher than non-epidemic area and perceived that preventing and controlling of epidemic was the job of health control officers. It was also found that community leaders, the chairman of the local administrative organization, public health officers and community health volunteers were influential

on changing the behavior of the people.