| China is among the countries where earthquakes take place most frequently in the world. 60 percent of the areas have high earthquake intensity, and sand liquefaction is the main reason that causes seismic disasters. The evaluation of sand liquefaction is the most important content of engineering reconnaissance and the aseismatic design. So evaluating the sand liquefaction objectively and exactly is the precondition of taking preventive measures on areas where liquefaction easily occurs. It also relates closely to the safety and economic benefits of the projects.Nowadays, with the rapid development of cities and industries, human activities take on the characteristics of expansibility and instantaneousness, which produce much information data correspondently. The former information treatment methods in the field of soil, engineering can't meet the users' demand on exactness and alternation. So the visual evaluation of liquefaction information system becomes the urgent task in soil engineering.Based on the super capability of GIS, the paper discusses problems on layer management of related data, design of attribute tables, and data coding etc. The coefficient of the soil liquefaction resistance K and the coefficient of soil liquefaction hazard H are presented. The seismic sand liquefaction forecasting, liquefaction disasters forecasting, and prevention measures on liquefaction are also discussed.Using the software of Mapgis, the process of liquefaction database setup has been studied. Through spatial analysis and attribute statistic analysis of database, this paper got the forecasting distributive map of liquefaction degree and liquefaction disaster. Through examples presented here, we can conclude that the technology has advantages in data management, analysis, and visual evaluation.
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