Mallorca cathedral represent one of the most audacious example of Gothic architecture developed in Spain. As part of a larger project funded by the Spanish Ministry of Culture and of a EU-India cooperation project an important analysis of the cathedral is being carried out aiming to the control of the structural behavior of the building. The installation of a static and dynamic monitoring system on the structure was part of this project. This thesis work examines the great amount of data registered by the dynamic monitoring equipment.Defining the dynamic characteristics of the building and their variation caused by external factors,such as environmental and loading effects, aiming to make a complete diagnosis of the building and to define dangerous situations that can occur in the future.