Elementary school children is a strategic target of health promotion, because of their proportion in the population and considering that they are in the early stage of personality development. They ought to have a healthy behaviour, however evidence in Cisalak showed the contrary. An intervention study con- ducted to elementary school children showed that before the intervention, both knowledge and practice were poor. But, in the end of the intervention the knowledge and practice score was considerably higher than before. Non parametric test such as Wilcoxon paired sample test and Spearman correlation were used to analyze the data. Conclusion of the study were: a) health promotion intervention has been proven to improve pupil’s behavior around 30 – 240 %, b) the knowledge among school children has strong correlation with their practice. For those reason we suggest the government to conduct sustainable promotion of clean and healthy behavior through elementary schools.