Research conclusions:The geophysical prospecting should be used for the karst survey along with drilling． The attention should be paid to the study on the geological structure and the survey method and the detailed and accurate survey report should be supplied． The characteristics of the load on the pile should be considered carefully in design．The reasonable parameters for the calculation of the pile' s bearing capacity should be chosen，The reliable method should used to evaluate the stability of the roof and the scientific experiments should be done if necessary to verify the accuracy of the calculation and ensure the engineering quality．