Abstract: The additional pressure drop due to solid of the feeder for the absorber spheres pneumatic conveying was investigated in the positive pressure transport system. The absorber sphere was replaced by the glass sphere and transported with the ambient air as the source gas. The steady state air velocity of the feeder inlet, u_a, is in the range of 14.29 m/s. The calculated average coefficient of feeder local resistance is 3.1 from the measured pressure drop for gas stream. The additional pressure drop due to solid in the feeder first decreases from 3.09 kPa to 2.85 kPa with the increase of u_a from 14.1 m/s to about 17 m/s, and then remains about 2.85 kPa with the further increase of u_a. The ratio of the additional pressure drop due to solid and the gas phase pressure drop of the feeder deceases from 6.3 to 1.5 with the increase of u_a. The coefficient of additional pressure drop due to solid of the feeder deceases from 0.37 to 0.17 with the increase of u_a. The correlation of the coefficient of additional pressure drop due to solid of the feeder and the Fr is conducted for the design of the feeder pressure drop with similar working conditions.