Chinese is a tonal language. The tone is the pitch format of the whole syllable, and the modulation value is the actual tone value of the tone. The height of the voice is expressed in numerical form. Putonghua has four tones, each of which has a different tone value. Tone plays a distinctive role and is an important factor in constructing the beauty of Chinese phonology. Tone symbols are generally marked on the main vowels of a syllable, iu, ui tone symbols are marked on the following u or i. If the tone symbol is just marked on i, the small dots on i should be erased.