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The whole-process controllable ground-based microgravity test equipment is a new type of tower dropping device that uses linear motor to drive the experimental cabin, and the above drop mode to generate microgravity environment. It has the microgravity simulation ability of 4 seconds, and can simulate the gravity environment of the moon, Mars gravity and uniform motion. In order to ensure the smooth operation of the experimental cabin running on the orbit, it is necessary to closely monitor the operation status of the corresponding wheel and rail.First of all, the dynamic modeling is carried out according to the actual bearing of the shaft applied in the experimental cabin, and the dynamic simulation is completed. The fault analysis and comparison are carried out in the time domain and the frequency domain according to the different motion conditions of the experimental cabin, taking into account the different rotating speeds and different loads. Secondly, the different fault judgment methods are also analyzed on the whole motion guide. Finally, the data waveform and judgment method of the specific fault mode are obtained, which lays a certain foundation for the subsequent fault diagnosis of the motion guide in the experimental cabin, and validates and analyzes the subsequent experimental data obtained in the project, which has certain engineering value.