The Japanese army is conducting a gas attack on the Chinese army since October 1937, the Japanese army has successively launched several gas bombs in Beijing, Shanghai and Shanxi, resulting in hundreds of Chinese civilians being poisoned and vomited and killed. In 1938, the Japanese army was fully aware of the value of the gas war in the invasion of China and accelerated the further implementation of massive gas warfare. In August 1938, the Japanese army's upper level wrote "The poison gas warfare and its cases", "Special Smoke Shuttle Law and its outcomes" and "Special Smoke Shuttle Law and its outcomes." In 1938, the Japanese army has been distributed to the high-level commanders with a large number of exhaust gas and exhaust gases, to guide