Abstract:[Objective] To analyze the three-dimensional kinematic characteristics of the lumbar facet joint (LFJ) activity when stand- ing. [Methods] Ten volunteers without lumbar disease were recruited, and underwent high- resolution CT and dural fluoroscopy examina- tions. The lumbar spine model of the volunteers was established matched with the images obtained by the dural fluoroscopic imaging system to reproduce the instantaneous motion state of LFJ, and analyze its kinematic characteristics, such as displacement and rotation angle. [Results] In term of flexion and extension, the maximum rotation range was (3.6±2.7)° at L4~L5 segments (P＜0.05), while the maximum transla- tion range was at L5S1 segments (P＜0.05). The left-right translation range at L3~L4 was significantly greater on the right side than on the left side [(0.9±0.5)mm vs (0.4±0.5)mm, P＜0.05], while which at L4~L5 segment proved greater on the left than the right [(1.6±0.8)mm vs (1.1±0.4) mm, P＜0.05]. In term of lateral bending motion, the maximum rotation range was (4.9±4.4)° in L3~L4 segments (P＜0.05), while the maximum translation range was at L3-4 segments (P＜0.05). The translational range of LFJ at the L4~L5 level was significantly greater on the left than on the right [(0.7±0.5)mm vs (0.6±0.4)mm, P＜0.05]. In term of rotation motion, the rotation range of L3~L4 was the largest (2.6±1.7)°, and the translation range of L3~L4 was significantly larger on the right than the left [(0.7±0.5)mm vs (0.6±0.4)mm, P＜0.05]. [Conclusion] The move- ment characteristics of LFJ are related to its movement mode, with complex postures dominated by coupled motion.