Cantonese, known as Cantonese and Guangfu dialect in Guangdong and vernacular in Guangxi, is a kind of tonal language and belongs to Sino-Tibetan Chinese dialect. It is the mother tongue of Guangfu people in Guangdong and Cantonese people in Guangxi. Widely used in central and western Guangdong, southeastern Guangxi, Hong Kong, Macao and some countries or regions in South China and Southeast Asia, as well as overseas Chinese communities.

There are as many as nine tones: yin and yang are divided horizontally, and the yin tone (from the ancient voiced initials) and the yang tone (from the ancient voiced initials) are well coordinated. There are three tones, including yin tone (upper yin tone), middle tone (lower yin tone), yang tone, long vowels with middle tone and short vowels with yin tone, such as "Ba [pat3]" and "Bi [p tone T5]".

Nine tones and six tones: Yin Ping, Yin Shang, Yin Qu, Yang Ping, Yang Shang, Yang Qu, Yin Entering, Zhong Yin Entering and Yang Entering.

Nine tones and six tones are nine tones and six tones. Simple understanding: First, one tone corresponds to one tone, six tones correspond to six tones, and the other three tones are entering tones.