Abstract： This paper studied the distribution performance of a reservoir distributor with complex inlet tube under different conditions. The result shows that the performance is improved with the increase of mass flow rate or the decrease of quality. The average STD is 2.8%. A simulation modeling was made. A new double-barrels distributor was proposed to reduce the influence of the complex inlet tube. The average STD is 2.36%, which is 15.7% better than the original sample.