The purpose of this study is to find out educational method of Equality Particles, {mankeum/cheorum/kachi} for Korean learners. In Korean linguistics, these morphemes can not be explained clear. Moreover in Korean language education, only some limited meaning of {mankeum/cheorum/kachi} is introduced at the level 2, and then their actual usage is showed many errors. To identify the semantic similarities and differences of {mankeum/ cheorum/kachi}, it is used Sejong 21'th century's Project corpus and Korean learner's error corpus. As a result, {mankeum} is used as a bound noun and a particle, {cheorum} as a particle and {kachi} can be used as a particle and a adverb. In this case investigations, {mankeum}'s meaning is extended, "the difference between a certain amount of> different levels of degree> degree of similarity of> equivalence" In contrast, {cheorum} has the meaning of 'degree of similarity' and 'equivalence' between two comparative objects. Lastly, {kachi} is derived from {katta} as an adjective and has the meaning 'equivalence' like {cheorum}. (SoonChunhyang University)