The high-frequency PIV was applied to measure the flow field near the lateral jet under the condition of rigid vegetation and flexible vegetation. Both the Single row vegetation and broadleaf grass were analyzed. The results showed that different vegetation arrangements have different effects on the jet flow field. The vegetation arrangement and vegetation resistance cause significant changes. The changes in flow velocity with changes in water depth displayed "S" type and anti-"S" type distributions, and the flow velocity of free layer was approximately logarithmic. Due to vegetation resistance and jet pressure differences, the lateral jet trajectory in water with vegetation also have different distributions. The lateral jet trajectory in water with broadleaf grass was more likely to bend than in water with rigid vegetation Compared to the influence of two vegetation arrangements on the water flow near the jet, the flexible vegetation has a better deceleration effect on the flow field near the lateral jet.
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