In this paper, the effects of environmental factors on snow simulation in civil aircraft ground testing are analyzed and technical support is provided for adaptive testing of civil aircraft in snowfall environments. Snowy weather has a significant impact on the propulsion system, flight control system, and flight performance of civil aircraft. Based on the analysis of natural and artificial snow formation mechanisms and the requirements for snowfall simulation testing, an outdoor simulation system for snowfall in civil aircraft ground testing was established. Tests were conducted to investigate the influence of environmental factors on snowfall simulation. Temperature and humidity ranges were established to achieve snowfall simulation, creating snowfall environments with specific snowfall intensity and density within these ranges. The results in this paper effectively support the adaptive testing of civil aircraft in snowfall environments.