The present paper presents the modeling of standard Basque intonation to be used in text to speech conversion systems. The parameterization process of the Basque f0 curves made according to Fujisakis intonation model is explained: experiments made in the placing of the phrase commands of the model are described and the results of these experiments are analyzed. The statistical analysis of the obtained parameters using classification and regression trees is described and the results obtained in this study are also explained.