In order to explore the different dynamic characteristics between different section forms of beam,using the finite element modal analy-sis calculation software Ansys12. 1 for rectangular,round,and four kinds of hollow I-shaped section beam,results show that the modal frequen-cies of circular cross section than the cross section of his high,changes occurred mainly in the first four modes in the main is the transverse ben-ding deformation and bending deformation.%为了探究不同截面形式下简支梁的动力特性差异，利用有限元计算软件Ansys12.1对矩形、圆形、工字形以及空心四种截面的简支梁进行计算模态分析，结果表明圆形截面的模态自振频率要比其他截面高，在前四阶模态中主要出现的变化是横弯变形以及竖弯变形。
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