In order to investigate the dynamic characteristics of permeable asphalt concrete,a 74mm steel split Hopkinson pressure bar (SHPB)apparatus was used to conduct uniaxial impact compressive test with various strain rates for permeable asphalt concretes with polyester fiber content of 0 and 0.3%.The test results showed that there is a significant strain rate effect on permeable asphalt concrete and the specimen compression ratio increases with increase in strain rate;the specimen compression ratio of the permeable asphalt concrete with polyester fiber is about 1.2 times as large as that of the concrete without polyester fiber;the dynamic stress-strain curve of permeable asphalt concrete includes 3 stages of elastic deformation stage,plastic deformation one and failure one;observing the failure mode of permeable asphalt concrete,the aggregate fracture is considered as the main reason for permeable asphalt concrete failure;polyester fiber in permeable asphalt concrete can delay cracks appearing and spreading and improve dynamic compressive strength, the largest strength increase can reach 45.1%.%为研究透水沥青混凝土的动态力学特性，采用φ74 mm钢质分离式霍普金森压杆装置对不掺纤维和掺0．3％聚酯纤维的透水沥青混凝土进行了不同应变率的单轴冲击压缩试验。研究表明，透水沥青混凝土具有明显的应变率效应，试件压缩率随着应变率的增大而提高，掺聚酯纤维透水沥青混凝土的压缩率是不掺纤维的1．2倍左右；透水沥青混凝土的动态应力－应变曲线可分为弹性变形阶段、塑性变形阶段和破坏阶段。从试件的破坏形态可以看出，集料的断裂是透水沥青混凝土破坏的主要原因。在透水沥青混凝土中掺加聚酯纤维能够延缓裂缝的出现和开展，提高材料的冲击抗压强度，增幅最大为45．1％。
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