A study on the anti-sliding stability of hydraulic structures on subbed soil has been made. Using the anti-sliding test results of dragged concreting pressure plate in foundation pits, the decreased value of anti-sliding bearing capacity after spring back influenced of subbed soil is determined; envelope of anti-sliding shear stress and friction coefficient are also quantitatively determined. It is suggested to use the maximum compressive stress σmax of eccentric load to predict structure displacement, sliding and creepy slippage of subbed soil, to determine sliding contour creep, and limit the maximum compressive of subbed soil. Two built hydraulic structures are reviewed and calculated by drafted method, and the results are accord with real conditions.