The principle of laser technology called "laser decompression" is that a small change in tissue volume will lead to an exponential change in pressure. In vitro experiments showed that the intervertebral disc pressure increased 1 13 kPa when the tissue volume increased by 0.3 ml. Based on the above principle, decompression surgery can be performed in vivo under local anesthesia. Specifically, a needle is inserted into the central part of the intervertebral disc, and then a Nd: YAG laser beam fiber capable of transmitting 1.32 micron wavelength is inserted into the needle. The laser starts to work with one pulse per second until the energy of 800 ~ 1000 Joule is transmitted to this part. The pressure is measured by a sensor with a diameter of1mm. The measurement of intervertebral disc before, during and after laser surgery found that the decompression effect after laser surgery was abnormal.