Abstract: It is classified and discussed th at some key technical problems met in the construction process of large span ste el structures.These problems are as follows:(1)stability checking of the structur e and component members during the lifting process;(2)pulley-structure analysis under applied loads;(3)temporary supports influence on the structural safety;(4)sa fety problem due to the removal of the temporary supports;(5)tracing analytical c omputation and method for the pre-stress steel structure during the constructio n process;(6)continuous tracing computational approach in structural erection pro cess;(7)computation and forming of flexible structures;8)design and computation o f integral hoisting of the large span structures.