Based on dynamic similarity theory, dimensional analysis was adopted to acquire the similar relationship between the test model of tower-line system and its prototype, and then the similarity ratio was determined which was employed in designing gan-shaped tower, glass-shaped tower and test model of conductors and ground wires. Next, the finite element model of tower-line system and its prototype was established, followed by static and dynamic analysis. Through the comparative studies of relevant parameters, It found that the similarity relationships between test model and its prototype was correct and could be derived from each other. So the experimental result based on this test model reflect dynamic property and rules of structure prototype. The design process of the test model provided reference for other similar test model as well.