The objective of this study is improve the technology by various testing devices for measuring degree of compaction. The methods for quality control for compaction are very various. But, normally the specifications have provided PBT(Plate Bearing Test) method when inspector tested quality control. In spite of the PBT has a few weak points to reduce process and cost. In order to improve quality control method, analyzed in-situ test results between PBT and other devices.(LWDT and Geogauge)