笔者初学方言,长期搞不清调类和调值。后来才逐渐领悟,语音研究时刻都离不开音类和音值问题。音值决定音类的划分,可是相同的音值在不同的方言里未必属于相同的音类。在汉语发展中,声母和韵母的音值两相牵引或排斥,又互为条件。声韵调的音类划分有各自不同的特点。搞清音类和音值问题,对初学者至关重要。 I beginner dialect, long-term confused tune and transfer value. Only then gradually comprehend, voice research moment can not do without sound category and tone value problem. The sound value determines the division of sound classes, but the same sound value may not belong to the same sound class in different dialects. In the development of Chinese, the sound of initials and vowels is towed or rejected by two phases, which are mutually different. Phonetic tone tone classification has its own different characteristics. To clarify the sound and sound value problems, for beginners is essential.