According to the information known by enterprises, the main business is mainly concentrated in the following seven sectors: first, the infrastructure construction sector, mainly including major municipal projects such as road and bridge projects; The second is the maintenance and management of roads and bridges; Third, reserve oil sales; Fourth, the transformation of land reserve, that is, on behalf of the municipal government, engaged in the transformation of urban construction land reserve, including the transformation of old areas; Fifth, build public rental housing; Sixth, real estate development, including the development of major projects supporting commercial housing; Seventh, exhibition management and others.