Abstract: As a new type of track, Ladder Sleeper is developed based on the theory of Longitudinal sleeper. It overcomes the shortage of the traditional Lateral sleeper in many aspects, but some of its important features remain unaddressed. The existing research mostly focuses on the static behaviors. With the development of the high-speed train, the dynamic problems of railway are becoming more and more prominent. In order to understand the dynamic characteristics of Ladder Sleeper fully and to lay the foundation for the analysis of Ladder Sleeper Track, this paper investigates the vertical vibration modal to get the natural frequency and vibration mode. The results show that Ladder Sleeper has the characteristic of integrity and transitivity.