Several factors influence polymer modified asphalt in modification systems. Key factors include the type and concentration of polymer used, which affects the viscosity and elasticity of the asphalt. The compatibility between the polymer and bitumen is crucial for achieving optimal performance. Additionally, the processing temperature and time during mixing can impact the dispersion of the polymer. Lastly, the specific application requirements, such as climate and traffic conditions, also play a significant role in determining the effectiveness of the modification.