While it is common knowledge that eyeglasses need to be tested and fitted, hearing aids need to be tested and fitted, but this is less well known. Before the 1980s, hearing aids were sold in China mainly through department stores and pharmacies, where the clerks “sold” them to customers like ordinary everyday goods. These clerks lacked basic audiological knowledge and sold (instead of matching) box-type and behind-the-ear hearing aids based on their experience. As a result, people with hearing loss often think that their hearing aids are ineffective or too loud because they cannot buy the right hearing aid for them. Many people buy hearing aids through others in big cities or abroad, but the result is that they are often left unused. It is important to understand that hearing aids are not simply sound amplification devices, but have many modulation aspects such as tone, volume, and sound output, so wearing a hearing aid is not a commercial activity but a strictly medical one. Many seniors think that a hearing aid can solve their hearing problems, but this is wrong. The hearing of each individual is different, and the hearing aid fitting not only takes into account the nature and degree of deafness, the environment and the individual’s needs, but also the nature of the hearing aid itself, the trial fitting and the repeated experience of the fitting effect, and finally the most suitable hearing aid is chosen and the frequency of the hearing aid is adjusted according to the different needs of the patient. The hearing loss is different, and the gain given by the hearing aid is also different. With the popularity of hearing aids in China, the hearing aid industry has also developed rapidly. At present, hearing aid sales stores are very common in China, and the fitting of hearing aids has gradually become systematic, formalized and specialized. If you go to a professional hearing aid fitting center, you can get a hearing aid that suits your hearing.