The Third-line Construction is an economic construction in the inland regions of China for the purpose of the preparation for war from the middle of 1960s to the beginning of 1980s,which focused on the military industry.Gansu province played an important role in the Third-line Construction.It had a great positive influence on the rapid development of the fundamental establishment,the improvement of distribution in the national defense industry,and the promotion of the development of raw and processed materials and the equipment manufacture.It also promotes the development of the cities and the social progress of backward and minority district.