Cochlear implants have been used as an effective treatment for severe to profound sensorineural deafness since its inception, and patients with low-frequency residual hearing are now being considered as candidates for CI. Low-frequency hearing provides patients with the information needed for speech recognition. Studies have shown that speech recognition is significantly higher in patients with preserved low-frequency hearing after CI than in those with low-frequency hearing loss, and that the level of low-frequency residual hearing is positively correlated with postoperative speech recognition. Improving postoperative rehabilitation outcomes, improving quality of life, and preserving residual hearing have become common goals for doctors and patients. Minimally invasive and residual hearing preserving cochlear implantation is aimed at ‘minimizing inner ear trauma and maximizing functional preservation’. This technology is important for preserving the delicate structure and residual function of the inner ear, providing a better structural basis for newer therapeutic techniques such as hair cell regeneration and stem cell transplantation, and allowing for the application of new technologies, especially in infants and children. The long-term preservation of low-frequency residual hearing, especially for infant and pediatric implant patients, can protect their future “colorful voice” for a long life.