This study aims to determine the effect of buteyko breathing technique on asthma control test.The quasi experimental study with the pretest and post test one group design approach involved 14 patients with asthma selected from the Lung Polyclinic of Dr. Hasan Sadikin Bandung with consecutive sampling. Asthma control was collected using time series ACT. The collected data were analyzed descriptively and inferentially with the scale of significance p smaller than 0.05.The results showed a significantly higher mean difference between ACT scores after buteyko breathing technique 19.79 more or less 1.47 with ACT score at week III 17.50 moe or less 1.78 week II 12.64 more or less 1.82, week I 9.57 more or less 1.95, and pretest 7.64 more or less 1.82. Post hoc analysis found the fourth week post test score 19.79 more or less 1.47 significantly better than post test week III 17.50 more or less 1.78, week II 12.64 more or less 1.82, week I 9.57 more or less 1.95, and pretest 7.64 more or less 1.82 in improving asthma control. It was concluded that there was an effect of buteyko breathing technique on asthma control test. Thus, the results of this study become important as a study material for nurses at the Hospital in an effort to increase asthma control test. Keywords: ACT, Breathing Technique, Bronchial Asthma, Buteyko