Japanese aggrandizement of economic force towards Heilongjiang Region before the September 18th Incident;

Then,the army began to be disintegrated after September 18 Incident and was further disintegrated after the Xi an Incident by the central government or KMT government in Nanjing via frequent dispatching.

However,his combination became a contradiction between unification and localism during the period from September 18 Incident to the fall of .

Japan s Nationality Policy towards Koreans in Northeast China before the September 18th Incident;

Influence of the September 18th Incident on Migrants Moving from inside the Shanhaiguan Pass to Northeast China;

Analysis on the Moving Reasons of Immigrants from North China to Northeast China Before the September 18th Incident;

“Life Weekly” s understanding of Japanese invasion of China and its views of Chinese people s resistance to the aggression before September 18th Incident;

Before and after the"September 18th Incident",relying on its geographical advantage gained through invading and occupying Korea,Japan instigated Korean Wave People to carry out wild smuggling activities in the Northeast of China.