The e-learning is a distance learning system which offers training courses and custom tailored to the needs of learners. It is a measure allowing users to progress at their own pace. learning objects LOs are the most important teaching constituents in each training. Their index efficiently make reusable and thereafter profitable. In this article, we describe a system of indexation of learning style favored by learning object. This system based on the standard LOM-fr enable teachers to index learning styles suited to a LO and thereafter to seek the needs of learners and their preferences for learning. To adapt the standard LOM-fr of these requirements we propose to supplement other subcategories indexing (orientation of energy and method of collecting information).