The safety and accident principle, basic proposition in safety subject, and the macro/micro reasons of accident were described and explained, followed with the definitions of the qualitative and quantitative analysis methods of a group of basic concepts in safety subject, such as danger, safety, accident, hidden peril, hazard, safety management, and risk assessment.

A new clarification of basic concepts on roll-layout design of straight-arc type caster;

Defects in basic concepts of quantities and units in CIHAI(new edition);

Aiming at the confusing basic concepts in the pipeline risk assessment,the authors define some basic terms such as safety,risk,oil & gas pipeline risk,pipeline failure modes,risk assessment,risk analysis,risk management, risk estimate, risk control and risk decision-making etc.

In this paper several electric examples are quoted to show the importance of employing mathematic concepts to explain basic concepts and theories of electric circuit.

By definition of modern cost accounting contents,the author points out the way to improve cost accounting, puts out views on developing cost accounting in respect of establishing cost accounting assumption,defining precisely its basic concepts and re-assorting and reflecting expenditure elements.

Develop on internet tutorial courseware for the course of theoretical mechanics on the basis of basic conception;

This paper points out the students typical questions in studying the basic conceptions in course of Control Engineering Foundation,and enumerates the common mistakes in applying the basic conceptions to exercises.

To solve the problems on dynamics, we can start with the thinking method that combines elementary knowledge and basic conception In this way, we can train the students ability to think, ability to analyse and solve problems.

Therefore,we take the fundamental concepts of vocational education as the origin of the vocational education subject and make some discussions on them.