在外力作用下，由撑杆和索组成的可变体系将变为几何不变系统。要获得索绷紧结构体系，必须对体系的形态作出分析。为求解不稳定系统，得出空间形态的坐标及内力，本文提出了用广义逆矩阵理论及空间变换得出的迭代解法。结果分析表明，所提出的方法具有收敛快、精度较高的优点。 Under the action of external forces, the variable system consisting of struts and cables will become a geometrically invariant system. To obtain a tight structural system, it is necessary to analyze the form of the system. In order to solve the unstable system, the coordinates and internal forces of the spatial form are obtained. In this paper, an iterative solution method using the generalized inverse matrix theory and the space transformation is proposed. The result analysis shows that the proposed method has the advantages of fast convergence and high precision.