Abstract: Deep cement mixed (DCM) pile, jet mixing pile, and sand pile were commonly used for soft ground improvement, in which their quality was tested by loading test or core drilling method, but there are several shortcomings in these methods, for example, test results couldn't reflect the integrity of composite foundation. By in situ test of geophysical detection for composite foundation of sand pile, DCM and jet mixing pile, its compatibility was discussed. Test results showed that the integrity of composite foundation could be tested by these two geophysical detections.