In August 1931, japanese imperialism tries in vain to molopolize the ambition of Chinese northeast area appears, begin to produce the false testimony such as broken crosstie, army cap, firearms, will instigate invade China disturbance. On September 17, 1931, the Japanese army is instigate aggressive war, it is false spot in order to decorate a body beside railroad, come impute at the Chinese. On September 18, 1931 night, ins and outs of Japanese engineer river is defended, invade according to the Japanese army China the plan guides a soldier a few people, a paragraph of railroad that uses lake of wicker of north of city of dynamite general Shenyang is blown up, the purpose overturns Changchun comes the train of Shenyang, with impute at China, borrow machine start invade China war. On September 19, 1931 morning, the Japanese army is occupational and northeast armory, shenyang falls into enemy hands. On November 30, 1931, jiang Jieshi writes down " resist foreign aggresion must be installed inside " after the hand makes, the Japanese army is very fast occupational our country Liaoning, Jilin, Heilongjiang 3 provinces. In December 1931, the Japanese army begins to plunder wantonly Chinese goods and materials, shameless pillage carry goes to Japan.