In view of the fact that learner-centered instruction is the standpoint in education in new trends, teachers must be aware of students' characteristics in order to tailor their teaching to needs of learners. One of the areas which is closely related to characteristics and performance of language learners is the role of gender on language learning in general and writing performance in particular. Although various studies have been conducted to examine gender difference regarding different aspects of language learning, the results reveal inconsistencies. This paper attempts to consider the gender differences in writing performance and has some implications for policy makers who are to develop a curriculum compatible with the needs of language learners.