Pumps are considered the heart of any project includes fluid transportation or increasing of its pressure. For a long run, the piping pressure losses increases and the pump efficiency decreases which effect the system requirements of either discharge pressure of flow rate. A hybrid centrifugal-jet pump system is proposed in order to enhance the centrifugal pump performance to achieve the system requirements. The performance of the centrifugal and the proposed hybrid pumps are performed at a

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... d 2900 rpm for different ratios of centrifugal and jet pumps flow rates. The effect of the throat ratio (D/L) variation of the jet pump is also investigated at different ratios of D/L=0.33, 0.4, 0.5, 0.66. The obtained results show that the propose system increases the discharge head depending on the ratio of the jet and the centrifugal pumps flow rates. It found that the maximum increasing of the discharge head is about 43%. At the maximum flow rate ratio for all jet pump throat ratios. This means the variation of the jet pump throat ratio D/L has no observed effect on the hybrid system performance. Also the hybrid system map performance is also obtained at different throat ratio.