Luoyang pronunciation was the standard pronunciation in Tang Dynasty. Chang 'an is the capital of Sui and Tang Dynasties, and Luoyang is the east. At this time, the Chinese pronunciation in the Central Plains and Guanzhong evolved after blending with various ethnic groups and integrating into the language elements of neighboring ethnic minorities.
The imperial examination was invented in the Sui Dynasty, and it was not until the Tang Dynasty that it was pronounced in Luoyang. For officials, they must be able to speak the pronunciation of Putonghua, which also urges scholars all over the country to learn Putonghua and spread pronunciation. The conquest of Shu by Qin, Sui and Tang dynasties led to the rapid spread of Luoyang reading to the southwest.
Extended data:
Classification of putonghua
1, Beijing Mandarin, also known as North China Mandarin, is mainly distributed in Beijing, northern Hebei and central Inner Mongolia, and can be divided into four parts: Shi Jing, Huaicheng, Chaofeng and Shike. User population is about150,000. Three tones and four tones, the ancient entering tone is flat, up and down.
2. Jilu Mandarin is mainly distributed in most areas of Hebei, Tianjin, northern and northwestern Shandong, Pinggu District of Beijing, Guangling County of Shanxi Province and Ningcheng County of Inner Mongolia, with a population of about 90 million. Jilu Mandarin is the closest to Beijing Mandarin except northeastern mandarin. The main features are three tones and four tones, and the ancient entering tone is flat and falling tone.
3. Jianghuai Mandarin is distributed in most areas of Jiangsu and Anhui, parts of Hubei and parts of Jiangxi. The population of Jianghuai Mandarin is about 70 million, mainly distributed in the north of the Yangtze River except Bengbu in Anhui and Xuzhou in Jiangsu.
References:
Baidu Encyclopedia-Mandarin