Summarize the characteristics of Japanese occupation of northeast China.

At that time, the Japanese plundered the land and other resources in the northeast of China, plundered the cultivated land of the people of China by various illegal means, and expanded immigration to serve its "mainland policy" of invading China. The mainland policy, also known as the mainland strategic policy, is a foreign expansion policy based on Japan's invasion and annexation of China, Korea and other neighboring mainland countries by war after the Meiji Restoration, and it is the main feature and expression of modern Japanese militarism. Japan's mainland policy matured in the 1980s in 19 and was implemented in 1894- 1895.

Japanese implemented Manchu-Mongolian immigration policy, organized Manchu-Qing Immigrant Agricultural Society, and lured China people to buy fields and real estate with more money, thus expanding Manchu-Qing Agricultural Plan. "Three years after the establishment of the scheduled society, Japan and the Korean mainland can immigrate to Manchuria, Japan and 200,000 fresh farmers." After the September 18th Incident, in order to really occupy China, the Japanese sent a large number of immigrant "pioneering groups" to China. The Japanese government has formulated a plan for millions of agricultural immigrants to move to Manchuria, stipulating that within 20 years, there will be 6,543,800+0,000 and 5 million immigrants. From 1932 to 1945, there were more than 300,000 "national policy immigrants" during the Japanese occupation of Northeast China. Japanese immigrant "Pioneering Group" seized or forcibly bought China people's land at a very low price, which made 5 million farmers in China lose their land, be displaced and suffer greatly. At the same time, the Japanese immigrant "Pioneering Group" increased important human resources for Japan to colonize Northeast China, and also played a great role in limiting anti-Japanese armed activities and assisting the Japanese army to control Northeast China.