Abstract: Starting from the securement problems in human realistic decision making, the concepts of the safety matrix, the safety index and the risk matrix are put forward in this paper. To go a step further, the method of safety analysis in decision making is given. By using the method (l) the degree of safety in the result of some decision making could be expressed, measured, calculated and analysed, (2) some problems of decision making, which can not be solved by AHP, could be solved; (3) the decision makers would get the sense of safety on his options. Importantly, that the ways to identify parameter about the safety index is given here make the method in this paper more practical.

Key words: decision making, safety matrix, safety index, analytic expression, identifying technique