This study aimed to determine the effect of Buteyko's breathing technique on changes in peak expiratory flow rate and quality of life of asthmatics. The method used in this research is literature search using online databases such as Pubmed/Medline, Proquest, Science Direct, and EBSCO. The results showed that from ten experimental studies of the Buteyko Breathing Technique, BBT significantly affected peak expiratory flow rate (PEFR) and quality of life in adult asthmatics. In conclusion, the Buteyko breathing technique proved to be quite effective in increasing the PEFR value and quality of life in asthmatics, without any side effects in the subjects studied.   Keywords: Asthma, Buteyko Breathing Technique (BBT), Quality of Life, Peak Expiratory Rate, Peak Expiratory Flow Rate (PEFR)