78 Copyright © 2020, IGI Global. Copying or distributing in print or electronic forms without written permission of IGI Global is prohibited. Chapter 5 DOI: 10.4018/978-1-7998-1021-6.ch005 ABSTRACT Document indexing is an active domain, which is interesting a lot of researchers. Generally, it is used in the information retrieval systems. Document indexing encompasses a set of approaches that can be applied to index a document using a corpus. This treatment has several advantages, like accelerating the research process, fnding the pertinent contains related to a query, reducing storage space, etc. The use of the entire document in the indexing process afects several parameters, such as indexing time, research time, storage space of treatment, etc. The focus of this chapter is to improve all parameters (cited above) related to the indexing process by proposing a new indexing approach. The goal of proposed approach is to use a summarization to minimize the size of documents without afecting the meaning. An Approach of Documents Indexing Using Summarization Rida Khalloufi Sultan Moulay Slimane University, Morocco Rachid El Ayachi Sultan Moulay Slimane University, Morocco Mohamed Biniz Sultan Moulay Slimane University, Morocco Mohamed Fakir Sultan Moulay Slimane University, Morocco Muhammad Sarfraz https://orcid.org/0000-0003-3196-9132 Kuwait University, Kuwait