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Students havent all the way devoted much attention to the study of chemical bond conception.They always have a smattering of knowledge,and do not understand its connotion or extension,and therefore they havent handle it very skillfully or make mistakes easily.These all lead to that students think it hard to have much more memory in studying Chemistry.They fear to study it.They gradually lose interest in chemistry.On the other hand,in recent years in university entrance examination papers there are many more papers in chemistry, in which they investigate students much knowledge in understanding their conception level.Students lost their marks very seriously, they hard get their high marks.This condition makes it obviously more very important to raise the teaching level in chemical conception.