Abstract: Taking the preposition "Yi ( 以 )" as the research object, this paper examines relevant errors of Korean students in the
HSK dynamic composition corpus of Beijing Language and Culture University, classifies and analyzes the errors, explains the causes
from the two perspectives of negative transfer of the mother tongue and transitional generalization of the target language, and uses
comparative analysis theory and difficulty level models to predict the difficulty of word order acquisition of the four sentence patterns
containing the preposition "Yi ( 以 )". Finally, three suggestions are put forward for the misuse of the preposition by Korean students.

Key words: corpus, ?preposition?"Yi?( 以 )", ?error?analysis, ?difficulty?level, ?Korean?international?students