The hydro-physical properties of black soil under different type of eco-systems were studied. The results showed that bulk density, SOM, porosity, soil moisture capacity and wet-aggregates run down, when grass eco-system turning crop eco-system. But, fertilizing can restrain the trend, the effect become more significant extra-adding organic manure. Fertilizing promotes planting, especially root growth to improve the hydro-physical properties, moreover, increasing SOM, improving soil structure, adjusting soil moisture capacity and porosity. Bare field eco-system became worse than crop eco-system, confirming plants make important effect to soil hydrophysical properties.