Objectives :Muscle energy techniques(MET) are used commonly for lengthening shortened musculature, improving joint function and range of motion. This article reviews articles on MET published for recent 11 years to consider effectiveness of MET. Methods :We searched Pubmed, KSI, KERIS, KMBASE, and national assembly library using “Muscle Energy Techniques” and classified the articles into subsets of posture, pain relief, increasing the range of movement, lengthening shortened muscles and inactivation of myofascial trigger points(MTrPs). Also we evaluated their values according to the Jadad Scale. Results :A total of 20 articles reconfirmed that MET reduce pain, increases range of motion(ROM), lengthens shortened muscles(especially hamstring) and inactivates MTrPs. But domestic articles scores 0 to 1 points in Jadad Scale. Researchers should make an effort to write clinically more reliable randomized controlled trials(RCTs). Conclusions :MET may be applied on various musculoskeletal problems, and further studies analysing its effect are needed.