| Eco-environment, which is the most fundamental existing condition of human-beings, has been getting more and more serious with the development of human society. It is and will be a long-term topic to study eco-environment problems in geological fields. Through the comprehensive ways of field investigation, remote sense & GIS, analysis of historical information, the ecological features and problems in Shaanxi Province has been systematically studied in this article. Furthermore, through the way of Quaternary Geology, Tectonic Geology and Geography, the coupling relation between eco-environment and geotectonics has been discussed based on the Theory of Dissipative Structure and the Hypothesis of Wavy Mosaic Structure.(1) Clear-cut of related ideas. Based on the Theory of Dissipative Structure, it is pointed out that eco-environment is one grade of dissipative structures, and that eco-environment is a compound and organic system of materials, energy, information and their connections, with human system as the principal part. Secondly, ecological meaning of geotectonics is provided based on the rule of geotectonics being one of the energy source of eco-environment. In addition, it is considered that geotectonic is controlling the entirety of eco-environment through the way of adjusting solar energy once more.(2) The ecological features and problems such as soil erosion, desertification, lack of water, degradation of ecological function in Shaanxi Province, which is threatening the environmental safety both of Shaanxi Province and periphery areas, are systematically studied, including the initial calculation of the economic loss of problems by the methods of substitution of market value, and so on..(3) Through the way of field investigation, remote sense & GIS, analysis of historical information, the influence of climate, landform, surface materials and human activities on eco-environment is comprehensively studied, which is leading to the conclusion that natural factors but of human activities are the main onesinfluencing the eco-environment, however, most of the natural factors are influenced or controlled by geotectonics in different degree.(4) The mechanism of the influence of geotectonics on eco-environment are analysized including the violent movement of Tibet Plateau and Qinling Mountains on the evolution of climate, weather and eco-environment, geotectonic movement on soil development, soil erosion and desertification. Especially, the control of X-type structure of Qinling Tectonic Knot on rainfall and temperature is emphasizedly studied. Concludedly, it is pointed out that geotectonic is deeply influencing the erosion rule and is the decisive factor of desertification and lack of water in Huanghe River Valley in Shaanxi Province.(5) Based on the Theory of Dissipative Structure and the Hypothesis of Wavy Mosaic Structure, the coupling relation between eco-environment and geotectonics is theoretically discussed, and the main points are:i) Degree of the order of eco-environment is higher in tectonic wave-dense belt than in tectonic wave-scatted belt. The ecological system in tectonic wave-dense belt is particially non-stable but stable in whole while the ecological system in tectonic wave-scatted belt is particially stable but non-stable in whole.ii) Degree of the order of eco-environment extends in the direction of tectonic range while alters in the direction of tectonic tip.iii) Degree of the order of eco-environment is getting lower in wave-type from tectonic wave-dense belt to tectonic wave-scatted belt.iv)The influence of tectonic wave-dense belt on the degree of the order of eco-environment in tectonic wave-scatted belt depends on the degree of intensity of tectonic wave-dense belt.v )The most ecologically fragile area of a block is not in the geometrical core of the block but near the tectonic zone with weaker tectonic intensity.Based on the above rules of the coupling relation between eco-environment and geotectonics, the coupling relation between the en...
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