Emotional speech classification is a current area of research with wide variety of applications in intelligent human-machine interaction systems. For classifying emotional speech signals, it is quite common to use either statistical features or temporal features. This paper focuses on the data preprocessing techniques which aim to extract the most effective acoustic features to improve the performance of the emotion recognition. The limited size of existing emotional data samples, and the relative higher dimensionality have outstripped many dimensionality reduction and feature selection algorithms. Finally, we applied this technology on mobile phone.