Seismic precursor is very complicated.Its temporal and spatial distribution is quite unequal, but in some places and during certain periods it may appear obviously.It is possible to predict earthquake successfully if we have corresponding ability of monitoring and analysing earthquake. Based on the fact of successful impending earthquake prediction in Jiashi and several others in China.authors have analysed the possibility and limitation of impending earthquake prediction in the paper.Finally.It is pointed out that because earthquake prediction is not successful generally, the predictions were made mainly by experience.In this situation,it might be better to take tactics of solving easy problem firstly and hard problem secondly,and to concentrate ascendant strength on the important monitored regions where seismic precursors would appear frequently.