| Summary |
The soiling of structures have come to be cause for claims recently， and it is indispensable for us to study on the soiling of the membrane structures which are easier soiled than the other types of structures because of the variety of their shapes and materials involved. It is the most effective way of studying of soiling of the membrane structures to research the actual state of soiling with respect to various kinds of shapes of membrane structures and materials of the membrane left under the same condition (the same time， the same environment，etc...). We rarely have such chance，and we usually evaluate the state of soiling state of membrane by the actual exposure tests. But
the exposure test do not necessarily represent the actual state of soiling with respect to the difference of shapes in the membrane structures. Last year，we could have a good opportunity to research the actual state of soiling of the membrane structures which were mainly pavilions of the Expo'90. Thus，the actual state of soiling by the difference of the shapes on the membrane structures is reported.
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