Nowadays, in a competitive business environment, when the information of technology is well used it becomes of a great value among companies that search for excellence in customer relationship attendance. Therefore, more and more often, the companies are searching for alternatives to ease the management of activities, increasing control, reducing costs and getting important information that can result in quicker decisions and consequently improve the level of the service. Recently, the WMS is being implemented in general by the biggest logistics operators. A Booz Allen & Hamilton´s research in partnership with the Center of Studies in Logistic in 2001 (CEL-Coppead) evidenced that up to 50% of the logistic operators have already been using this technology (Costa et al., 2001). Due to the growth of WMS use and the possibility for the author to participate in an implementation of this technology in a company during her Master Research, the objectives of this work are: to map the operation of the Alpha Company´s Distribution Center (DC) before WMS implementation; and analyze the WMS implementation process in a DC that is in operation. Since the author was part of the team in the implementation of WMS in the Alpha Company, the methodology used for the elaboration of this work included: bibliographical research, visits in loco to the Alpha Company´s DC and non structuralized interviews with the involved parts in the operation. As a result of this work, we have an analysis of the operation before and during the implementation of the WMS in line with the main results of the simulations, given that until the present moment, due to strategic changes in implementation chronogram the WMS still has not become a reality in the Alpha Company.