The relationship of unstable osmosis coefficient to time and osmosis deep is derived from the osmosis equation in this paper. Mercury porosimeter is used to study the pore structure of cement mortar. The method of volume density is used to determine the changes of specific pore volume, and therelation between pore structure and impermeability is analyzed. Although the drythermal curing method has many advantages over other curing method, the directional pore along the direction of evaporization of water is formed inside concrete. The harmful pore above 2000(?) is increased and the average diameter of pore rises. As a result, the mortar impermeability loses seriously.
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