By using marine large volume air-gun seismic source and land seismic stations ( including mobile stations and permanent stations) and Ocean Bottom Seismometers，a deep seismic exploration experiment was carried out for the first time in the Taiwan Strait． Experiment result showed the seismic stations could receive the seismic signals from the air-gun arrays of the “YANPING 2”science investigation ship as far as 280km away． Tens of thousands of high quality seismic data were obtained successfully and different types of P-wave seismic phases were identified． A one dimensional crustal structure model about HX9 section shows that the crustal structure which is reflected by Pc and PmP reflection wave from two velocity discontinuity surfaces and basement refraction wave ( Pg) constitutes the basic characteristic of the crustal structure in this region． The depth of Conrad discontinuity and Moho discontinuity is respectively 16． 0 ～ 17. 5km and 28． 0 ～ 29． 5km．