The super steel truss continuous beam bridge at the Second Double-line of Lanzhou-Xinjiang Railway from Ping’an to Xining, crossing Lanzhou-Xining Highway is going to be born in the Third Project Dept. of No.3 Company, Group Bureau 21 of China Railway Construction. It has the biggest longspan and this kind of structure has been used the first time.  The super bridge is 2,698.2 long, 77 joints totally. The main bridge is being used the continuous steel truss combining structure 80+168+80 meters, whose longspan is the bigget at domestic.