Abstract: In order to solve problems of slow filling speed and poor filling effect in filling process of air blowing seed metering device，whith was core component of planter，and improve filling efficiency，air assisted seed filling device of air blowing seed metering device was designed.Through comparison between mastered data and physical prototype，qualitative working process principle was analyzed，and structure was optimized on this basis.Test analysis results showed that，seed metering effect of air blowing seed metering device with air assisted seed filling device was better than that of general air blowing seed metering device，intermittent air flow was helpful to improve filling qualified rate，filling performance and filling efficiency.