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By means of the K-ε turbulence model and finite element method, the flow of the fluid in the valve and the piston during a cycle of pumping is simulated and calculated. The motion law of the crude oil in the valve passage and concentric annulus in the upstroke and downstroke is analyzed.

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And the scores of the inner annulusand the first quadrant swimming time the rat fetuses got in Morris water maze test were analyzed with spss 11.0Results: There was significant differences in the scores of the inner annulus(0.1193±0.0810) and the first quadrant swimming time(0.5233± 0.1375 )that got in Morris water maze between the 30 min group and the

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