Some dynamic feature and effect of seismic waves by explosion are defined as seismic effects of explosion source. The methods and targets to appraise seismic effect of explosion source are put forward, including coherence function, converted coefficient of energy, attenuation factor of vibration time, spectra etc. The coherence function was introduced to analyse explosion for the first time. The physical principle and computational method of the aforementioned targets are represented. For the application, the experiment results of a certain charges are analysed and the data of the experiment shots from the DSS in the area from southwest of Shandong to north of Henan was dealt with, and they are basically identical. The method mentioned above will be useful for seismic exploration, seismic sounding, engineering seismics and seismic tomography.