抗日战争爆发后,日军加紧进逼我国沿海重镇,沿海的工商企业纷纷迁往内地,其中许多关于民生的企业和军工厂迁到云南昆明,随迁的还有大批人员。昆明一带人口猛增,企业生产与人员急需原材料和生活物资。当时的中国军工企业落后,只能生产轻型武器,而前线急需的大炮、坦克等重型装备,则要依靠国际援助或对外购买。交通的断绝,使昆明这个大后方的生产、生活陷入危机。中国沿海重要港口当时基本沦陷,西北 After the outbreak of the Anti-Japanese War, the Japanese army stepped up its pressure on China’s coastal cities and coastal industrial and commercial enterprises to relocate to the Mainland. Many of the enterprises and military factories concerned with people’s livelihood moved to Kunming, Yunnan Province, and a large number of personnel were accompanying them. Kunming area population soared, corporate production and personnel in urgent need of raw materials and living supplies. At that time, China’s military and industrial enterprises lagged behind and could only produce light weapons. The heavy artillery and tanks that the frontline urgently needed needed to rely on international aid or foreign purchases. The cut off of traffic, Kunming, the rear of the production, life in crisis. At that time, the important coastal port of China basically fell to the northwest