National examination which called Ujian Nasional (UN) in Indonesia, is an activity of measuring and evaluating the achievement of national graduate competencies in certain subjects. Nevertheless, UN is always be a controversy because of many negative effects in multi-aspects, such as physical, moral, and psychological. The students are spending their time in study (try out, course) for preparing UN and it makes students lack of sleep, lack of exercise, and lack of appetite which makes them fatigue and easy to get sick. National examination is also increase cheating practice due to afraid of failing the examination and pressure from parents to get high score. Besides, UN can cause many negative effects on psychological, one of them is anxiety. The anxiety arises due to excessive subjects facing the students, and they feel fear that the result of the national examination is not satisfactory. Extreme anxiety can harm physically, cognitively, emotionally, and behaviorally. However, the anxiety disorder can be treated using pharmacology and non-pharmacology treatments. One of the non-pharmacological treatments for the anxiety stays through a wudu intervention. Besides having the value of worship for the doors, the wudu has similar principle as hydrotherapy in overcoming the anxiety. This research aims to determine the effect of performing wudu in reducing the anxiety among high school students facing the National Examination. The study is a quasi-experimental using the pretest and posttest with control group research design. The subject was 70 respondents who selected through the simple random sampling technique. The instrument is S-AI (State-Anxiety Inventory). The data was analyzed its significance by using T-Test. The results of paired t-test analysis show the value of p= 0.000 (p <0.05) in the intervention group and p= 0.948 (p> 0.05) in the control group, which means that there are significant differences in the intervention group before and after performing wudu therapy. Therefore, it can be concluded that there is the effect of implementing wudu in reducing the anxiety in the high school students facing the National Examination.