The aim. To develop a method for endonasal endoscopic dacryocystorhinostomy (EEDCR) and evaluate its effectiveness in monitoring patients in the early postoperative period. Materials and methods. The study group (1st group) consisted of 45 patients with chronic dacryocystitis (CD), who underwent EEDCR according to the developed method, the comparison group (2nd group) included 36 patients who, after performing the developed EEDCR, an implant was installed in the dacryorhinostoma zone. The control group (3rd group) included 28 patients who underwent EEDCR according to the generally accepted method. Patients of groups 1 and 2 were divided into 2 subgroups: 1A and 2A included patients who underwent computed tomography of the lacrimal ducts in the preoperative period according to the developed method, and patients of subgroups 1B and 2B – according to the traditional algorithm. Reliably the best results of restoring lacrimation function were in subgroups 1A and 1B already from the 3rd day of observation after surgery, as well as in the subsequent periods of observation. The worst values of lacrimation function were recorded in the control clinical group with a statistically significant difference from other groups (p0.05). Results. A method of EEDCR has been developed, a comparative analysis of groups of patients according to the above indicators has been performed when observing patients in the early postoperative period. On the first day after surgery, the mean score of the severity of lacrimation according to the Munk scale significantly decreased in all groups and gradually decreased on the 7th day and after 2 weeks (p0.05). Conclusions. The developed EEDCR method complies with the principles of sparing surgery, is effective in the treatment of patients with CD, while there is a faster rate of recovery of the lacrimal function and mucosa, improves the quality of life of patients