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This paper studied the fluid flow in a spool valve numerically using the k-ε two-equation model of turbulent flow, while experimental results were drawn out by means of particles image velocimetry technology. The numerical result is compared with the experimental one to verify the viability of the numerical method. Based on many times calculations, it is found that the spool valve’s steady axial flow force can be reduced considerably just by modifying the relative position of the oil ports and buckets.