A method for setting elastic threads in a ligation device and an automatic elastic thread ligation device using the method. At least one elastic thread (2) is arranged along the outer wall of a barrel (3) of the ligation device, and formed at the front end of the elastic thread (2) is an annular sleeve (21) with an adjustable aperture sleeved on the outer wall of the front end of the barrel a traction thread (26) on the ligation device is connected with the annular sleeve (21) of the elastic thread (2), and when being pulled, the traction thread (26) drives the annular sleeve (21) to move towards the orifice of the barrel (3) until the annular sleeve is disengaged from the orifice the force bearing part of the annular sleeve (21) at the front end of the elastic thread is abutted against in a forward direction, meanwhile, the tail end of the elastic thread (2) is drawn in a backward direction, and these two acting forces being under countertraction enable a gradual decrease of the aperture of the annular sleeve (21) at the front end of the elastic thread (2). In the automatic elastic thread ligation device, rubber rings are replaced by the elastic threads after the annular sleeve at the front end of the elastic thread is pulled by the traction thread and bounces out of the orifice of the barrel, the aperture of the annular sleeve can be decreased gradually by drawing the tail end of the elastic thread until the aperture becomes approximately zero thus a tighter ligation can be achieved for a target tissue, and even after the necrosis and dropout of the target tissue, there is still an extremely small ulcerated area, and the probability of postoperative bleeding is lowered.Linvention concerne un procédé pour régler des fils élastiques dans un dispositif de ligature et un dispositif de ligature de fil élastique automatique utilisant le procédé. Au moins un fil élastique (2) est disposé le long de la paroi externe dun cylindre (3) du dispositif de ligature, et un mancho
