According to the hypothesis,the financial insecurity index of China,by which China s financial insecurity can be demonstrated,is created by the method of factor analysis.

Then an approach was put forward to evaluate the potential risk of thermal runaway in exothermic reaction system by use of system safety index, and the equilibrium region o.

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.

This paper introduces comprehensive index calculation method of accident index,safety management index and safety index from several item indexes which are used to judge the enterprises\' safety condition.

Based on the construction of vegetable variety pollution dynamic response coefficient and cumulative influence coefficient, the concept of vegetable variety security index is presented, which was used to establish the vegetable variety security control system.

Calculation methods of accident index,safety management index and security index,etc were created.

Detecting Buffer Overflow in Binary Code by Analyzing Unsafe Functions;