The purpose of this study is to examine the acquisition of Japanese conditional expressions by Korean learners of Japanese as a L2. Specifically, by comparing the distribution of conditional expressions in text written by Korean learners of Japanese with that by native Japanese speakers, this study clarifies the features of the acquisition of conditional expressions by the Korean learners found in the text. The data pertaining to the Korean learners of Japanese were obtained from the corpus of Japanese-language technical papers written by Korean researchers of the Japanese language and Japanese language education. The data relating to native Japanese speakers were taken from Hori(2005). The following results were obtained. First, the conditional form ト(to) is used much more often than different conditional forms. Second, introductory expressions with a conditional form, especially ト(to), are used much more commonly than conditional expressions. Third, the use of the ‘conditional’ type of バ(ba) conditional expressions is less common than the ‘hypothetical’ type of バ(ba) conditional expressions.