Abstract: The results from drilling in Mahu sag of Junggar basin have confirmed that there exits abnormal formation pressure in the Permian and Triassic strata, with characteristic of high pressure and high productivity. The available prediction methods for formation pressure by well logs and seismic velocity data are all based on mudstone undercompaction theory. For glutenite reservoir, its formation pressure prediction may result in big differences between the predicted pressure and the measured one. According to such a characteristic, the well logsseismic velocity data combination for formation pressure prediction is adopted to form a set of technologies for it, including seismic interval velocity method, characteristic curve inversion method and improved Fillippone formula method. The application of these methods achieves better results in Mahu sag of Junggar basin and provides basis for scientific drilling and efficient well deployment