The seepage control problem of soil and rocks dam on non-homogeneous infinite deep pervious dam foundation has not been resolved at present and there are many related real problems being solved in engineering.The paper calculated the length of unpermeable blanket on non-homogeneous infinite deep pervious dam foundation through establishing a mathematics model,and validated it through a related model experiment.The theory calculation and the experiment are validated to each other,So as to get the basic metho...