Introduction to the economic center in the rear area of ​​China's Anti-Japanese War: After the start of the Anti-Japanese War, China's factories and mines moved inward one after another. Steel, machinery, military industry, shipbuilding, textiles, chemicals, etc. from North China, Shanghai, Nanjing, Changsha and other places were related to wartime military and civilian needs. Hundreds of thousands of industrial enterprises relocated to Chongqing, realizing an unprecedented and far-reaching "iron-blooded migration westward" in China's modern industrial history, becoming the industrial "backbone" supporting China's war of resistance. Chongqing is therefore known as the "Home of China's Wartime Industry". According to statistics, the factories that moved to Chongqing accounted for about 93% of the factories that moved to Sichuan and 54% of the factories that moved inland. This established a new industrial zone centered on Chongqing and built the most important economic foundation for China during the Anti-Japanese War. , supported the crisis of the Anti-Japanese War.