Based on the model test,we measure the dynamic water pressure and fluctuating pressure of spur dikes under different working conditions,and draw the contour maps and scatter plots of water pressure and fluctuating pressure,through which,we get the distribution law of the dynamic water pressure and fluctuating pressure under different water depth,flow and length of dike,and find out the reason for it according to the theoretical analysis.The conclusion is drawn that the dynamic water pressure increases with water depth,flow and length of dike,and the fluctuating pressure decreases with water depth and increases with flow and length of dike.