Abstract: In order to improve aspiration-efficiency of the jet aerator, an air-in pipe called inner pipe was set up to add one more aspiration in the aerator muzzle. Based on the CFD software FLUENT as well as experiments, the aerator internal fluidic field was computed and aspirating was analyzed. Conditions and status on inner aspirating were investigated in terms of pressure distribution, flowing velocity and volume fraction of air and water. Conclusions were drawed as follows: When the inner pipe was moved along the aerator axis among a certain range, it had an apparent impact on aspiration efficiency. If the axial location coefficient R equalled 0, the dual laterolog aspirating aerator reached its highest aspiration efficiency. Contrarily, while R=1, the aerator had its lowest aspiration efficiency. Furthermore, contrastive studies were carried out under conditions of no aspiration.