In order to improve the collection efficiency of the pipe network of the mixture dust removal system( taking the 2 × 500 m² sintering machine as an example) ，the flow field of the pipe network is analyzed by numerical simulation method，and the resistance balance of the pipe network of the dust removal system is optimized by setting the adapter bonnet on the branch pipe of the gas collection hood. The simulation results show that the speed and pressure distribution of the pipe network are in line with the characteristics of the pipe network powered by the fan，and the whole pipe network is in a negative pressure state，and the absolute value of negative pressure gradually increases from the air inlet of the pipe network to the general outlet of the pipe network. There is a serious air volume imbalance in the pipe network of the 2 × 500 m² sinter strand mixture dust removal system，and the air volume deviation of each suction point is more than 10% ，and the air volume imbalance rate of the 1st dust suction point of the pipe network is up to-65% under the design air volume in winter. The air volume imbalance rate of the 2nd vacuum point of the pipe network is up to-67% ; The addition of adapter bonnet on the branch road of the air collector can effectively adjust the air volume imbalance of the pipe network，and the deviation of the air volume of the air collection hood in winter and summer is not more than 10% ，which can make the air volume of each air collection hood meet the design requirements. The research can provide assistance for the preliminary engineering design，greatly save the cost of engineering commissioning，shorten the construction period，and help the adjustment and transformation of unbalanced air volume pipelines.