This study is descriptive quantitative research by using a test to collect the data needed. Iraqi English as a foreign language (EFL) students face difficulties in differentiating between using prepositions correctly. This study has been performed in the Department of English at College of Education for Women, University of Baghdad, to diagnosis the difficulties of English prepositions that face Iraqi first-year students at the University since multi-uses and meanings of prepositions. For Iraqi EFL students, prepositions regarded as a problematic criterion. This study aims at examining the problems that EFL students commit mistakes in using English prepositions of place "on." It also highlights the causes of those problems. Correct handling proposition is not because most of them have different functions straightforward, and different prepositions have the same uses. For this reason, the researcher adopted pre and post-tests to evaluate the output of the means of the students' results. The researcher used SPSS to analyze data.