EEG Studio is a computer program for analyzing electroencephalography (EEG) signals. This is brand new software for assessing EEG signals at both sensor and source levels. It can not only analyze endogenous brain signals, but also can analyze evoked and elicited brain signals. Such as somatosensory evoked potential, visual evoked potential, auditory event-related potential, language evoked potential, and many more. EEG Studio is a perfect tool for both researchers/scientists and clinicians. EEG Studio is based on C/C++ and it has very efficient and easy to use. Users can open data by “drag-and-drop”. The measurements of waveform, spectrogram and source are now very handy. This software program can integrate multiple complementary imaging modalities (EEG, MEG, MRI and CT) in a single package and environment. By combining the latest techniques for determining electrical activity in the brain with anatomical and functional imaging, the program provides a powerful new method for accurately reconstructing the source of such activity. The program uses the full physical anatomy from MR and CT to provide three-dimensional models of the head and brain, volumetrically delineating the site of activity. The novel functionalities make it suitable for wider applications. For example, by using just one button to make the main frame compatible either for standard monitor or widescreen monitor. It fits both 4:3 and 16:9 screen formats. With the dual monitor mode, the data analyses became even easier. The software contains number of non-editable world recognized montages; all features of those montages are available in one dialog window now. Clinicians can labels the waveforms with a click. The software can store all information about performed examination, clinical information, and analysis results for doctor’s convenient.