In order to avoid the adjacent segment disease resulted from spine fusion, the concept of non-fusion technology arose and is becoming popular. The posterior non-fusion devices in lumbar spine have used clinically, but no long-term follow-up data about these devices is reported, and the basic study is not enough. We reviewed the biomechanical evaluation about posterior non-fusion technologies in lumbar spine, including range of motion, intradiscal pressure, facet joints and the biomechanical methods. We found these non-fusion technologies have advantages in treating lumbar degenerative diseases, but more deep study needs to be done.