This paper presents a description of the buildings of the City of Arts and Science and defines the key elements that Calatrava uses in the designing of this complex. In the bigining is presented a general description of the City of Arts and Science which is composed by seven building. A further analysis is been done for each building, which is based in the context of the concept that Calatrava uses, such as the human being and the nature. Also is done an analysis in the context of shape, structure and materials, which are very connected with the concept of the architect. In the end, are analysed also the elements that are similar with the other his prior projects and how they have been developed. These elements also have been served and for his recent works. The paper concludes that the key elements that Calatrava uses in this complex are almost the key element that Calatrava has been used in the other prior projects. These key elements which are also present in its recent works, creates the design vocabulary that Calatrava uses in his projects.