Based on the threshold value of earthquake warning parameters(characteristic period τ_c and displacement amplitude P_d),we use the seismic waveform data recorded by Inner Mongolia seismic network to study the estimation method of potential damage area of moderate strong earthquake in Inner Mongolia in this paper. According to certain screening conditions,the statistical relations between τ_c and M_L,P_d and τ_c and epicentral distance R are fitted out. Then according to the maximum magnitude corresponding to the existing earthquake events,when the instrument intensity is set as IV and M_L=5.0,the corresponding parameter thresholds are P_d=0.1075cm and τ_c=0.686s. Finally,two moderate strong earthquakes in Inner Mongolia in recent years are simulated. The results show that the relatively higher network density is required in application of this method. If the network can be evenly distributed,the effect will be better. Otherwise,the result is only determined by the empirical relationship,but the actual observations do not come into play.