Abstract: Engineering test results showed that: plain fill under the natural state will produce the consolidation, but affected by their own gravity and also by rainwater infiltration, exposure to sun and wind drying and other factors. The upper part is mainly influenced by rainfall infiltration, exposure to sun and wind drying effect, while the lower part mainly affected by gravity. So the fill of this consolidation is not simply the self-weight consolidation, we refer to as the natural consolidation. The results also show that: after a certain period of time, in rainwater infiltration, exposure to sun and wind dried under the action of a certain depth, the upper part of the fill consolidation degree is better, and the formation of "crust", the filling time of four years the fill in the depth of 6 meters, its mechanical properties equivalent or close to compaction energy for 2160kN · m tamping and filling, so it can be used for settlement sensitivity requirements of light low buildings and roads. For the bearing stratum of pile load, it lower project cost, and is safe.