A multi-leaf collimator control method and system. The method comprises the steps of: controlling a multi-leaf collimator to be initialized and to move to a zero position； receiving treatment data, the treatment data comprising position information of a number N of treatment points and the shapes of fields at the N treatment points； rotating a treatment head to the conformal position of the first treatment point, and controlling the multi-leaf collimator to begin to conform the shape of the field at the first treatment point to start the treatment at the first treatment point； when the treatment head is rotated to a conformal position between the K-1th treatment point and the Kth treatment point, controlling the multi-leaf collimator to begin to conform the shape of the field at the Kth treatment point to start the treatment at the Kth treatment point； and carrying out the described operations repeatedly until the treatment at all treatment points is completed. The multi-leaf collimator control method and system can reduce treatment deviation during the treatment caused by improper control for the conformation of the multi-leaf collimator and radiation of the treatment head, thereby avoiding radiation damage to normal parts of a patient.La présente invention concerne un procédé et un système de commande de collimateur multilame. Le procédé comprend les étapes suivantes : amener un collimateur multilame à s'initialiser et à se remettre en position zéro ； recevoir les données de traitement, les données de traitement comprenant les informations de positions d'un nombre N de points de traitement et les formes des champs auxdits N points de traitement ； entraîner une tête de traitement en rotation jusqu'à la position conforme du premier point de traitement, et amener le collimateur multilame à commencer à se conformer à la forme du champ au premier point de traitement pour démarrer le traitement au premier point de traitement ； après rotation de la tête de traitement jus
