Abstract:A construction project in Gangcheng district in Ji'nan is located within the scope of the original Huangzhuang coal mine. There are large-scale coal mine goafs under the surface, and the specific scope and depth data are missing. After the stop mining of Huangzhuang coal mine in 1994, the original village buildings have been maintained in the study area without demolition and development, systematic goaf investigation and surface deformation monitoring. By using the existing mining data, adopting a variety of geophysical means, the distribution range and depth of the goaf in the study area have been found. It will provide a reliable basis for the later goaf treatment design and engineering construction, and avoid geological disasters of goaf collapse.