Volume efficiency is one of the key indicators of fuel pump.Based on the traditional optimization design, the volumetric efficiency factor was focused on, a multiobjective optimization mathematical model was established with the minimum endface power loss and the radial power loss of the fuel pump. Isight’〖KG-*2〗s multiobjective optimization algorithm Pointer was applied to optimize the structural parameters. The optimal values of the structural parameters and the change laws of the influence of each parameter on the gear pump were obtained under the prescribed constraints.It is helpful for the simulation optimization of the fuel pump efficiency in the later design stage.