Total number of third-line construction sites

The total number of third-line construction sites is 15.

1, China's strategic rear area construction centered on strengthening national defense in 1960s and 1970s is an important part of national defense construction and national economic construction.

2. The third-line construction is an extremely large-scale industrial migration process in the economic history of China.

3. The background is the hostile relationship between China and the Soviet Union and the US offensive on the southeast coast of China.