| Taking the greenhouse as application object, based on the analysis of the test data by the theory of Rough sets, and using the theory of structure mechanics, the dissertation presents a new method of optimizing designing of greenhouses' structures based on the rough sets theory. The research consists of such items:The research designed greenhouse models for the tests of the illumination and the air temperature inside them, and created a database for the test.Based on the theory of rough sets, the research completed the values of the miss attribute and the uncertain factor with the reasoning method. Meanwhile the research also analyzed the import degree of the term attributes.Compared and analyzed the information of the completed data, the research confirmed the important attributes of the greenhouse performance and also gave some trend-lines of them. According to that, the research put forward a new method for optimizing designing of greenhouses' structures completely based on the analysis of the tests data and the importance of the attribute.The research synthetized greenhouse structures' influences on the daylighting and the heat preservation. Then the research optimized the greenhouse structure, and provided a greenhouse optimized model base on the baiyin region.Using the theory of structure mechanics and other knowledge, the research analyzed and checked the bearing capacity of the model. Meanwhile based the aim of cutting down the quantity of rolled steel, the research optimized the greenhouse model's structure, and deduced the formula of calculating. So the research reduced the cost of greenhouses.The research provided a theory foundation and technical sustain for the development of establishment agriculture and the standardization of building greenhouse in the country. Meanwhile the research gave a new method of optimizing designing of greenhouses' structures, which completely depended on the data mining of tests.
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