The paper introduces the features of the light Falling Weight Deflectometer( FWD),adopts the deflectometer and Benkelman beam, checks the bridge abutment,culvert back walls,deflection value of inspection wells and compaction,and concludes the regression relationship of the static and dynamic deflections according to the comparative analysis of the tested data,and builds up the relevance between the site compac-tion and dynamic deflection.%介绍了轻型落锤式弯沉试验仪（ FWD）的特征，采用FWD与贝克曼梁，检测了桥台台背、涵洞背墙、检查井周围的弯沉值及压实度，通过对比分析检测数据，得出了静态弯沉与动态弯沉的回归关系，并建立了现场压实度和动态弯沉之间的关联结论。
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