Landslide hazard is a serious natural hazard next only to earthquake and floodwater. It has brought about great losses to the economic and social development worldwide. Each year it causes a loss up to billions of dollars in the whole world. A striking amount of money has been spent on the prevention and redress of the hazard and much more losses have been incurred indirectly in addition. In China

mountains where landslide hazards happen frequently and densely cover 70 % of the area. China is among those countries stricken most by these hazards. These hazards give rise to loss with a total value of hundreds of millions Yuan and great damages to the country and people’s lives and properties. Since till now the damage and loss evaluation of secondary hazards has not been touched upon; the authors propose an evaluation model by making use of causal diagram combining failure tree analysis (FTA) and event tree analysis (ETA) to make reliability analysis of the secondary hazards system and forecasting of the losses thus arising from.