Abstract: Logical thinking is not only one of the most important parts of stud ents- integrated ability, but also one of the most basic ways to cultivate thei r creativity. As an essential component of logic, formal logic plays an impo rtant role in the training of students- thinking ability. The article begins w ith a discussion of logical truth in terms of both ample and essential conditi ons in false speech proposition, and then proceeds with an analysis of of the rules governing thinking in logical issues with the illustrative examples and finally sums up the major points for a sound training of students- logical t hinking in the teaching of logic, with a view to guiding students to follow l ogical rules and improving their logical thinking.