On Comparison[Abstract] In this paper, the writer intends to conclude the usage of comparison: ways of expressing comparison; Single-,two- and three-variable comparison; Patial contrasts between comparison and main clause; the modifying elements in the comparative structure; incomplete, in consistent or illogical comparison; "than" different structure and some special usages of word: comparison1 Ways of expressing comparison:There are many ways to express comparison--including comparison of equality, inequality and proportion. It can be expressed by a comparative clause or a simple sentence including comparison. Now we discuss the patterns individually:Comparison of equality:This is used to show that two persons or things are, on comparison, found to be equal in a certain respect. And we mainly use the following patterns to support it:A: Sub. +Predicate + as +adj./adv. +as +contrast elementFor examples:You are as tall as he (is).Your book is as new as mine(is)The students worked there as hard as the workers negative form:Sub.+[pred.+not]+as+adj./adv.+as+contrast-elementFor examples:This dictionary is not as thick as that does not run as fast as Jack(runs).Jack is not as strong as Mike(is).More+adj/: Sub.+pred.+no+ less +than+contrast+elementadj./ examples:She is no less diligent than her elder minute too late is no more in time than half an hour(is).We too have a head and two hands and are no stupider than others.* women, no less than men, are participating in all kinds of work in the socialist construction of their country.* Note: If the comparison between two subjects, the predicate should agree with the first subject. For example:He no less than you is (not "are") is no less diligent than . Simple sentenceThis kind of comparison of equality is a simple sentence, supported by some words or phrases to express the comparison. Such as: " Same, the sameas, like, alike, equal, equal to ,similar, worth, identical" examples:The two children are exactly of same is the same in height as was said to be quick-witted, like his the climates of California and Italy alike The depth of the seas equals the height of the themes of the two novels are inch of time is worth an inch of gold.