Abstract:[Objective] To provide imaging data for accurate puncture in percutaneous transforaminal endoscopic discectomy (PTED, TESSYSTM technique) for prolapsed lumbar disc herniation (LDH) . [Methods] A total of 78 patients who were undergoing PTED for pro- lapsed LDH were enrolled in this study from July 2014 to September 2021. Preoperative images were used to measure the width of interverte- bral foramen, safe horizontal distance, horizontal angle and head tilt angle during puncture. In addition, the imaging data were used to guide the puncture in real operation, and verified by the precise, efficiency and safety of the operation based on whether the expected puncture tar- get was reached. [Results] There was no significant difference in the width of intervertebral foramen among different prolapse extents (P＞ 0.05) , whereas which were of statistically significant difference among different levels in the same prolapse extent (P＜0.05) . The foraminal width was significantly ranked up- down as L3/4＞L4/5＞L5S1. However, there were no significant differences in the safe horizontal angle, the body surface distance between puncture point and spinous process in the same segment with different prolapse extents and in different seg- ments with the same prolapse extents (P＞0.05) . Applying the abovementioned imaging data as guide, all the patients achieved accurate tar- geted puncture point and had operation completed successfully. [Conclusion] The preoperative image measurement data are beneficial to develop personalized puncture planning and guide safe and accurate puncture during surgery.