Differing literary and colloquial readings for certain Chinese characters are a common feature of many Chinese varieties, and the reading distinctions for these linguistic doublets often typify a dialect group. Literary readings (/) are usually used in loanwords, names (geographic and personal), literary works (like poetry), and in formal settings, while colloquial/vernacular readings (/) are usually used in everyday vernacular speech.

For example, Mandarin normally read "white" () with colloquial pronunciation bái (), but can read it with the literary pronunciation bó () as a name or in some formal or historical settings. This example is particularly well known due to its effect on the modern pronunciation of the names of the Tang dynasty (618–907) poets Bai Juyi and Li Bai (alternatively, "Bo Juyi" and "Li Bo").

Literary and colloquial readings of Chinese characters

The differing pronunciations led linguists to explore the linguistic strata. The colloquial readings is generally believed to represent a substratum, while their literary counterparts a superstratum. Such differences reflect a history of dialect mixing and the influence of education and instruction on the area.

Literary and colloquial readings of Chinese characters

Characteristics

Colloquial readings typically reflect the native phonology of a given Chinese variety, while literary readings typically originate from other Chinese varieties, typically more prestigious varieties. Colloquial readings are usually older, resembling the sound systems described by old rime dictionaries like the Guangyun, whereas literary readings are often closer to the phonology of newer sound systems. In certain Mandarin and Wu dialects, many literary readings are the result of influence from Nanjing Mandarin or Beijing Mandarin during the Ming and Qing dynasties.

Literary and colloquial readings of Chinese characters

Formal education and discourse usually use past prestigious varieties, so formal words usually use literary readings. Although the phonology of the Chinese variety in which this occurred did not entirely match that of the prestige variety, literary readings tended to evolve toward the prestige variety. Also, neologisms usually use the pronunciation of prestigious varieties. Colloquial readings are usually used in informal settings because their usage in formal settings has been supplanted by the readings of the prestige varieties.

Because of this, the frequency of literary readings in a Chinese variety reflects its history and status. For example, before the promotion of Modern Standard Chinese (Mandarin), the Mandarin dialects of the Central Plain had few literary readings, but they now have literary readings that resemble the phonology of Modern Standard Chinese. On the other hand, the relatively influential Beijing and Canton dialects have fewer literary readings than other varieties.

Some Chinese varieties may have many instances of foreign readings replacing native readings, forming multiple sets of literary and colloquial readings. A newer literary reading may replace an older literary reading, and the older literary reading may become disused or become a new colloquial reading. Sometimes literary and colloquial readings of the same character have different meanings.

An analogous phenomenon exists to a much more significant degree in Japanese, where individual characters (kanji) generally have two common readings – the newer borrowed, more formal Sino-Japanese on'yomi (), and the older native, more colloquial kun'yomi (). Unlike in Chinese varieties, where readings are usually genetically related, in Japanese the borrowed readings are unrelated to the native readings. Furthermore, many kanji in fact have several on'yomi, reflecting borrowings at different periods – these multiple borrowings are generally doublets or triplets, and are sometimes quite distant in time. These readings are generally used in particular contexts, such as readings for Buddhist terms, many of which were earlier go-on () borrowings.

Behavior in Chinese

Cantonese

Cantonese literary and colloquial readings have quite regular relationships. A character's meaning is often different depending on whether it is read with a colloquial or literary reading.