Abstract: To increase the effectiveness of ground flutter simulation test for space vehicles, the key factors influencing the results of ground flutter simulation tests were analyzed, with a focus on critical flutter speed. The practical guidance for test implementation based on this analysis was proposed. By examining the test flow, six major factors that may affect the test results were identified. Subsequently, three time-domain simulation models were established for the ground flutter simulation test system: the principle model, the idealized model, and the detailed model. These models were utilized to systematically analyze the identified factors and their influence on ground flutter simulation tests. The results demonstrate that the clock frequency of the hardware equipment affects the critical flutter speed, with 1000 Hz as the recommanded value. Additionally, the phase delay of the loading system significantly impacts the critical flutter speed. Therefore, during the test, it is crucial to ensure that the loading control algorithm maintains high phase tracking accuracy. This research aims to provide aerospace designers with more accurate flutter assessment test approach.