The aim of the paper is to examinetypes of errors of paragraph writing of Iranian learners of English
at under-graduate level in Bushehr University of Medical Sciences and Health Services. The data for this study
were 90 first year medical students at under-graduate level in Bushehr University of Medical Sciences and
Health Services as foreign language learners participated in this research. The outcome of the study shows
that the total number of errors committed by the learners was 290. Based on the classification, it was found that
the total number of errors committed by the students was 209 in pre-test of the paragraph writing and in the
post-test of the paragraph writing was 81. The result of the study showeda significant difference between
pre-test and post-test in paragraph writing of Iranian EFL students