A pedicle screw and rod fixing system and structure having dual flexibility of the screw and rod, which are applied in orthopedic surgery and neurosurgery； a comprised pedicle screw and connecting rod are a flexible pedicle screw and a flexible connecting rod respectively, both of which have a micro-dynamic function； between a screw body and screw base of the flexible pedicle screw, rigid rods at both ends of the flexible connecting rod are connected to one middle flexible body or to a plurality of flexible bodies that are distributed at intervals and that are composed of cylindrical springs； the flexible pedicle screw is formed by connecting the screw body and the screw base at two ends of a cylindrical spring respectively； the flexible connecting rod is formed by connecting and fixing a rigid metal rod respectively at each of two ends of a cylindrical spring； and the outer diameter of the cylindrical spring is not greater than the outer diameter of the connected rigid metal rods. Since both the screw and the rod have elastic activity, the spinal segments fixed thereby have a better non-fusion fixation effect than a single flexible nail and rod. The present invention helps to reduce the concentration of stress between adjacent segments, and helps to prevent deterioration between adjacent segments.L'invention concerne un système de fixation de vis pédiculaire et de tige et une structure présentant une double flexibilité de la vis et de la tige, qui sont appliqués en chirurgie orthopédique et en neurochirurgie ； une vis pédiculaire et une tige de liaison constitutives sont respectivement une vis pédiculaire flexible et une tige de liaison flexible, les deux ayant une fonction micro-dynamique ； entre un corps de vis et une base de vis de la vis pédiculaire flexible, des tiges rigides aux deux extrémités de la tige de liaison flexible sont reliées à un corps flexible intermédiaire ou à une pluralité de corps flexibles qui sont répartis à intervalles et qui sont constit
