Plitvice Lakes is the oldest and the largest national park in the Republic of Croatia. Its exceptional untouched beauty has always been attractive to nature lovers, so on April 8th, 1949, this area was declared the first national park in Croatia. In 1979, Plitvice Lakes National Park was inscribed on the UNESCO World Heritage List demonstrating that its value goes beyond the national boundaries. Due to the confrontation with excessive attendance, hasty and unplanned construction, Plitvice Lakes Nation Park, as the only area in Croatia listed on the UNESCO World Heritage Site, is threatened to be deleted from the list. The subject of this thesis is to investigate how and in what way has the National Park Administration responded to the key challenges in an excessive number of visitors through the Visitor Management Program. The goal of this thesis is to show how much and to what extent did the National Park successfully stopped negative trends with the aim of sustainable tourism management in protected areas by introducing new, sophisticated, and modern visitor management technology. The thesis will also present and establish the connection between problematic issues, ie an analysis has been presented as well as the consequences of the excessive and uncontrolled number of visitors to the Plitvice Lakes National Park together with the solutions. The new visiting system has been detailed, with the general goals shown in the managing plan. Additionally, activities planned out to be carried out to benefit the National Park and the ecosystem have been stated. With the implementation of the new management system in the Plitvice Lakes National Park the number of visitors has not changed but is evenly distributed bringing a positive effect on the environment and satisfaction of employees.