Abstract: To enhance the effectiveness of ground-based flutter simulation tests for space vehicles, the key factors influencing the outcomes of these tests were analyzed, focusing on critical flutter velocity. Practical guidance for test implementation based on this analysis was proposed. By analyzing the test process, six key factors influencing the test results were identified. Subsequently, three time-domain simulation models were established for the test system: the principle model, the idealized model, and the detailed model. These models were used to systematically analyze the identified factors and their effects on the system. The results indicate that the hardware equipment’s clock frequency influences the critical flutter velocity, with 1000 Hz recommended. Additionally, the phase delay of the loading system significantly impacts the critical flutter velocity. 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 a more precise method for flutter assessment.