Abstract: In order to explore assessment method of vulnerability for hazard bearing bodies and its development direction under Natech environment, research status, main application scenarios, existing defects and prospects of evaluation methods were summarized from perspectives of relevance and uncertainty. The results show that from the aspect of research direction, existing research mainly focuses on physical vulnerability rather than social and urban vulnerability. Then, from that of research methods, fault trees, bow-tie diagrams and Bayesian network can show correlation between causes and consequences. Additionally, regression model can calculate proportion of accidents caused by each reason and find out roots of vulnerability upgrade. Due to lack of systematic studies, although its combination of Bayesian network and simulation system makes estimation of vulnerability more accurate, the method has not been widely used in Natech risk assessment.

Key words: Natech, vulnerability, risk assessment, relevance, uncertainty