Furnace City is China's name for a city with extremely hot weather. Scientifically, the number of days with high temperature above 35℃ is used to measure the heat degree of a city. The days with the highest temperature above 35℃ in a year are more than 20 days, and there have been high temperature weather above 40℃. Everyone calls such a city a "stove". With the rapid development of economy, the price reduction of cars and the change of lifestyle, more and more people buy cars instead of walking; Coupled with the popularity of air conditioners, these are emitting hot air into the atmosphere. Urban population, high-rise buildings and dense roads. Concrete and asphalt pavements make solar radiation heat up quickly and dissipate heat slowly, and the heat island effect is becoming more and more obvious. The temperature of the city is rising gradually, and more and more "stoves" are emerging.

"Three Fireplaces": During the Republic of China, Chongqing, Wuhan and Nanjing were famous big cities along the Yangtze River, and the temperature was hot in summer, so they were called "Three Fireplaces".

"Four Fireplaces": Nanchang, Chongqing, Wuhan and Nanjing, four cities with hot summer climate in the Yangtze River basin, are called "Four Fireplaces". Nanchang is the hottest and windless city among the four stoves.

Others say that Chongqing, Wuhan, Nanjing and Jinan are the four furnaces.

"Seven Fireplaces": Nanchang, Chongqing, Wuhan, Nanjing, Changsha, Hangzhou and Shanghai at the latitude of the Yangtze River are called "Seven Fireplaces".

The saying of Kitchen Stove City originated from the folk, and it was first written as "Turpan, Wuhan, Jinan and Nanjing" in middle school geography textbooks.