| Railway construction of man-made soil erosion will inevitably have a large number of in situ experimental results show that the railway construction projects led to a major man-made soil erosion in the construction period. Man-made soil erosion caused during construction of the main reasons include the following: construction of the railway in the process of excavation works due to the destruction of surface vegetation, topsoil and vegetation between the original balance disorders, weakened ability to resist soil, In the rain against water erosion and soil erosion under gravity. Therefore research and development of "expert systems in railway construction soil erosion prediction and evaluation of research" is of practical significance.This paper combines the topic of Ministry of Railways (《study on the index system of the influence on the ecological EIA in the railway construction》(2005Z005)), aims at the characteristics and the technologies and methods which are applied widely at present of the soil and water loss, bases on the terrace of certain ES, and designs the total structural framework of ES using Visual Basic Language. It provides scientific basis for the ES of predication and assessment about soil and water loss. Firstly this paper carries on information collection and systemic analysis on domestic and foreign research situation. Secondly, it introduces the bought software recursive expert system and the knowledge base of expert system of predication and assessment about soil and water loss in the railway's construction. And based on the predicted content and mechanism analysis of soil and water loss in the railway's construction, and combined the relevant experts' opinions, it puts forward and builds the major structural frame of the soil and water loss forecasting expert system on the basis of theoretical research.Finally, the paper assesses the expert system really by analyzing examples, and puts forward the dependability and accuracy of applied system.
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