The purpose of this study was to assess the effect of nutrition education by the difference of BMI(Body Mass Index) group for adults at rural area. Eighty four adults (mean age : 55.9$pm$11.8) participated in nutrition education program. Data collection includes measured physical status and serum collections for health status. The impact of nutrition KAP (knowledge attitude and practice) and retention was examined among participants who were assessed at program entry, 3 times of education and 1 month of follow-up. The results were as follows: The participants were composed 14 persons of under 20kg/$m^2$ of BMI, 40 persons of 20-25 and 27 persons over 25 of BMI , female 60 persons but male 23 only. Serum albumin and calcium content of female(3.5$pm$1.2g/㎗, 7.5$pm$3.9mg/㎗) were significantly lower than males(4.7$pm$0.9g/㎗, 11.2$pm$4.6mg/㎗) but there was not significantly different with BMI groups. Serum TG and cholesterol contents of over 25kg/$m^2$ of BMI group(157$pm$87mg/㎗, 249$pm$16mg/㎗) were higher than other groups, but significantly different in cholesterol contents only. Via the 10 questions of nutrition attitude, the participants improved significantly between pre and post education(the score of pre, post and after 1 month, 6.5$pm$1.8, 7.2$pm$1.5, 7.2$pm$1.9), and were also attributed to better personal feeling health by modified CMI test, but dietary food habit was not significantly improved. As the differences of BMI groups were compared, 20-25kg/$m^2$ group had better the effect of nutrition education score than other groups, and female had better nutrition attitude and practice score than male.