Two methods are proposed:the conditional and non conditional inference techniques.

Based on the main researches on CRT, introduced the meanings of the conditional reasoning,.

The influence of three different kinds of valence(persuasive condition,dissuasive condition and neutral condition) and implicit arguments on conditional reasoning in two different positions(self and author) was researched with college students as the subjets.

Event-related brain potentials were measured when 13 normal young participants finished four kinds of conditional reasoning(MP,AC,DA,MT)tasks and one kind of baseline task(BS).

In order to testify model theory and reveal the cognitive mechanism of conditional inference,this article designed two experiments to testify "premise order effect" and "the facilitation effect" in college students.

The results indicated that people endorsed a conditional argument in direct proportion to the conditional probability of the conclusion given the categorical premise,and the process of resolving conditional inference is an intuitional and effective cognitive proce.

Syntactic theories and mental models theories were two different ways to understand processing mechanism of logically valid (MP) and logically invalid (AC) conditional inferences in discourse comprehension.

Through analyzing the backbone fracture to the mine hoist,build the mechanics model of backbone containing face crackle,inquire into the fracture situation of the backbone containing face crackle and obtain the fracture condition of the backbone while breaking as well as the calculating formulas of extreme size on crackle spread.