On the basis of the new earth view, the relation of degassing of the crust to seismic activities and its application to medium-and short-range and short-impending-range prediction of the Zhangbei-Shangyi earthquake of magnitude 6. 2 are discussed. It is proposed that some earth-quakes can be predicted. Therefore, the dynamic monitoring and study of degassing of the crust in the exploration of earthquake prediction, particularly the monitorying of CO2, H2, He and Hg gas releasing in a fault.