Evaluation of geo-hazard is the base of the prevention and alleviation of hazard. Based on indoor physical simulation and analyses of fractal geometrical characters, the mechanism of formation and the rule of basic development of the Yuci ground fissures are expatiated. In addition, the natural attribute of geo-hazard is studied, and the fatalness is evaluated and divided using the new nonlinear coupling technique of ANN and GIS. Then, the distribution of stricken body and development of local social and economy are analyzed, and the social attribution of geo-hazard and the vulnerability are evaluated using the new nonlinear coupling technique of AHP and GIS. After synthesizing the natural and social attribution of geo-hazard, applying the modern advanced GIS technology and based on the principle of compounding of variant geological information, the maps of distribution of the fatalness and the vulnerability are compounded, and the distribution of the hazardness of geo-hazard is confirmed. At last the paper presents the basic evaluation theory and methodology of "Three Maps" for ground fissure.