Construction of Yu - Dian highway helps exploiting mineral resources in west Panzhihua and central Guizhou, which will become the sites of fuel and raw materials for Chengdu and Chongqing and is a defense path to border and is significant to border trade development between Chongqing and Chengdu and each countries of southeast Asia and to improvement of border condition and to shortening distances between each provinces in southwest China and to regional coordination in southwest area.