Plain chloroprene rubber bearings of highway bridge are more vulnerable to corrosion of acid precipitation .In order to research on the various mechanics performance of plain chloroprene rubber bearings of highway bridge under different acid corrosion condition .The chloroprene rubber bearings were dealt with 3 .0% sulfuric acid for 20d ,40d ,60d and 80d ,and the compressive behavior of those were tested with pressure testing machine .The apparent ,dimension ,ultimate compressive strength , vertical stiffness and elastic modulus of compression were analyzed comparatively .The results show that local deformations of plain chloroprene rubber bearings of highway bridge become more obvious and brittle failures can happen more easily with the increase of contact time with acid corrosion .The attenuation law of the ultimate compressive strength of plain chloroprene rubber bearings of highway bridge under acid corrosion condition is analyzed ,and the parameters of the degradation model are es-timated by the least square method .Moreover ,the ultimate compressive strength ,vertical stiffness and elastic modulus of compression are more significantly decreased . The ultimate compressive strength ,vertical stiffness and elastic modulus of compression cannot meet the engineering require-ment while acid corrosion to a certain degree .Thus ,some preventive measures should be taken to pre-vente plain chloroprene rubber bearings of highway bridge corroding .%公路桥梁板式橡胶支座比其他橡胶支座更容易受到酸雨的影响，为了研究不同腐蚀时间下公路桥梁板式氯丁橡胶支座经过酸腐蚀后的各项力学性能变化，采用3．0％的硫酸溶液对公路桥梁氯丁橡胶支座分别进行20，40，60和80 d的酸腐蚀处理，并采用5000 kN压力试验机进行轴心受压试验研究．分别对其表观、外形尺寸、极限抗压强度、竖向刚度和抗压弹性模量等进行对比分析．结果表明腐蚀时间越长，公路桥梁板式氯丁橡胶支座更容易发生脆性破坏，其极限抗压强度、竖向刚度和抗压弹性模量等指标显著降低．通过承载力衰减规律对比分析，采用最小二乘法建立公路桥梁板式氯丁橡胶支座的极限抗压强度的衰减模型．当腐蚀到一定程度，极限抗压强度、竖向刚度和抗压弹性模量等已无法满足实际工程要求，建议在实际工程中要避免氯丁橡胶支座受到酸腐蚀的破坏．
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