Information transmission between the seawater and the air was blocked by the sea ice in the Arctic.In order to obtain the effect of ice on underwater acoustic signal transmission across the ice layer,an underwater acoustic signal detected experiment was carried by using a three-dimensional ice geophone in the Arctic Ocean center area.The incident angle into the ice layer was small (＜ 10°).A physical model of ice reflection and “free” Lamb modes were used to analyze the experimental data,the results are presented:(1) When 20 Hz-1 kHz acoustic signal was incident into the smooth ice layer from water,the reflectivity of some frequencies would be significantly reduced,93％ of the value of dips in reflectivity map would be lower than-10 dB,and some would even be lower than-20 dB.(2) The acoustic wave of the frequency band corresponding to that of the dips of ice reflectivity can be received by the geophone above the ice layer,and shows a stronger vibration velocity spectrum.It is consistent with the frequency band of the Lamb mode A2 and S2 waves generated simultaneously by the free ice model at the same site.These results can provide references for the study on pick-up and propagation of the underwater acoustic signal.