Abstract：The goaf has a complex structure, the stability of goaf was influenced by many factors easily.Engineering detection must be done before seting up engineering construction on it, and it is also needed to master the cavity, fracture development and geological structure of the goaf and its overlying rock.Then the evaluation on foundation stability must be done.Further study on drilling detection technology and physical detection technology should be made.Combined practical work verifyied that Application Research of Bore-hole TV Exploration Technology and EH-4 conductivity Imaging System can be used in goaf detection reliability.This will be a reference for goaf detection project design and construction.

Keyword：goaf;detection method;applicability;engineering example;