During puberty, the growth and development of the larynx is obvious, especially in males, but at this time there is a problem, the larynx scaffold – cartilage development is faster than the development of soft tissue muscles, which creates an incongruity, the vocal folds (including muscles and ligaments) are stretched out, the vocal folds are slender, congested, closed, unstable voice tone, the range of voice becomes narrower, and the high pitch is difficult. After one year, with the qualitative development of cartilage and the perfect development of muscles and ligaments, the voice will stabilize and the congestion will subside. The voice of some children is still poor due to the strength of the vocal cords, the voice is thin and low in tone without high and bright tones, commonly known as “male duck voice”, and even a few boys’ voices are small in volume and high in tone, often misheard as girls, which has a significant impact on the child’s social interaction and psychology. In fact, this is mainly a problem of pronunciation methods. ”Most of them can be improved and cured through pronunciation training, and if not, laryngectomy is also very effective. Voice protection during adolescence is a very important thing because the voice function is weak at this time and improper use of voice can cause permanent vocal fold damage (such as vocal fold scar) leading to permanent hoarseness, so we should pay high attention to it.