In order to solve the channel drainage question of low embankment for highway in North China Plain, combined with the entity project of Hengda section at the Daguang Expressway in Hebei Province, aimed at the characteristic of climate, geology, hydrology and low water table, good permeability stratum soil and its little and mass rainfall and deep drinking water well in the areas of North China Plain under design of the low embankment of Hengda Expressway, authors carried out the permeability test of typical soil, and studied the drainage design of the catchment filtration purification system, ...