Several factors influence polymer modified asphalt concrete in modification systems. Key factors include the type of polymer used (e.g., SBS, EVA), the polymer content, and the mixing temperature. Additionally, the compatibility between the polymer and bitumen, the shear rate during mixing, and the curing time also play significant roles. Environmental conditions, such as temperature and humidity, can further affect the performance and durability of the modified asphalt concrete. Proper selection and control of these factors are essential for optimal performance.