The frequent changes in the market turned any company`s focus to the final consumer. So, the ordinary distribution techniques, which usually pushed the production to the market, has being replaced by new techniques, where the product supplies are pulled by the market needs. One of these new ways of distribution is the Cross Docking system. This master`s thesis will present this system, in order to understand its structure and its aims. The Cross Docking concept immediately transfers the merchandise received at the point of reception, to the point of delivery, with the minimum time in between. So, this system can offer better service levels and keep a constant supply of products. In addition, this research has the purpose of identifying the main advantages and disadvantages derived from the use of this system and the main obstacles for its implementation. It will also make a field research, which will have the Empresa Brasileira de Correios e Telégrafos - ECT - as a basis for a simple observation of the reality. That is because the ECT operates with the same philosophy of the Cross Docking system, in which orders do not stay inside the Distribution Center but are immediately transferred to the outbound docks. So, this research has the purpose of diagnosing the distribution system, using the express services of ECT as the field research case study and the performance indexes such as, productivity and service level.