Introduction. Cochlear implants (CI) are considered to be the most effective treatment for patients with severe sensorineural hearing loss. CI are composed of three important parts: the external sound processor, the internal stimulation circuit, and the electrodes. In Otorhinolaryngology Clinic of Hospital "Timofei Moșneaga" the patients benefited CI with different electrode design, depending on the manufacturer. The aim of the work was to evaluate the post-implantation results according to the type of electrode. Material and methods. A group of 30 implanted patients in period 2014 - 2022 were distributed in 2 groups. The 1st group – patients what benefited from a cochlear implant with an electrode with active length of 19-20mm (10%), the 2-nd group benefited an CI with active length of 25-27mm (90%). Post-operatively, after one month, the audio processors were activated, fittings were made on time. Results. After 6 months, we did the audiological balance, the frequency bands that are stimulated by the distributed intracochlear electrodes were evaluated. It was established that at patients from the first group, the entire natural range of sound frequencies was stimulated. At patients from the 2-nd group, only medium to high frequencies was stimulated. Conclusion. To provide an accurate perception of a sound, the cochlear implant electrode array has to be long enough to cover the whole cochlea, to stimulate the full natural range of sound frequencies.