Abstract: Beam-String Structures and suspen-domes are two typical hybrid spatial structures. Nowadays they are popularly adopted for large-span roof systems such as air terminals, convention & exhibition centers and sports arenas. This paper discusses the shape determination of hybrid spatial structures, and then proposes an efficient numerical algorithm to implement it. On the basis of the general inverse equilibrium matrix of the lower cable-bar system and the dynamic relaxation method, this numerical algorithm is programmed using VC++ 6.0 and validated through some numerical examples. Hopefully the work presented in this paper could benefit the further research work and engineering practice on hybrid spatial structures.