Based on general finite element analysis software,the dynamic characteristics of large-span single-layer folded plate structure uses the subspace iteration method to draw the structural natural vibration frequencies,and analyzes the characteristics of the vibration modes. The analysis shows that the structure of 20 frequencies has obvious property of step,and low order frequency shows mainly for vibration in a horizontal direction of enclosed structure. According to the influence degree of various factors on the vibration mode and frequency is different,we obtain that the impact size on structural basic frequency by rise,ridge line height,loop line height and added mass.%针对单层网格折板结构的动力特性问题，基于通用有限元分析软件，采用子空间迭代法得出该结构自振频率，并分析了各阶振型的特点，分析结果表明：结构二十阶频率具有明显的阶跃性，低阶振型主要表现为围护结构水平方向的振动，并根据各因素对振型和频率的影响程度不同，得出了矢高、边脊线高度、环杆高度、外加质量分别对结构基频的影响大小。
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