By a simplified elastic wave through-the-earth communication system model, an experiment using BPSK modulated elastic wave as source signal to transmit the simulated stratified earth channel is performed in order to test the earth channel characteristics. Hence the through-the-earth channel amplitude-frequency and fading characteristics are achieved. By comparing features of the sending and receiving signals, conclusions can be drawn as follows: from the time domain, the receiving BPSK signal fading is an evident feature, and high frequency components attenuate greater than low frequency component. Experiment results also show that the experiment channel attenuation is up to the minimum level at 200~300 Hz.